CSS em and rem explained

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A look at the CSS units EM and REM, how they work and when you might want to use one over the other!
First I take a look at some basic examples of both ems and rems, then move onto some more interesting things with buttons and a call to action, as well how we can take advantage of both the em and rem with media queries.
The way the em unit is calculated actually changes depending on if being used for that element's font-size or if it's being used for any other property, and this can be leveraged in some pretty awesome ways!
Knowing when to use em vs rem can be a tricky business, but hopefully this video can help put you on the right track!
Find the Codepen here: codepen.io/kevinpowell/pen/RKdjXe
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If you'd like a behind the scenes and previews of what's coming up on my RU-vid channel, make sure to follow me on Instagram and Twitter.
Instagram: / kevinpowell.co
Twitter: / kevinjpowell
Codepen: codepen.io/kevinpowell/
Github: github.com/kevin-powell/

Опубликовано:

1 июн 2024

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Комментарии : 424

@reactmagic2348 3 года назад

Man finally someone gives me a real reason to use “rem” and “em” and explains it in a convincing way. This is why you are the master. Thank you sir

@Faiqa-Abbas 4 месяца назад

This is really helpful Kevin! Stay blessed!😄 So if we summarize: use *rem* with *font-size* because it always looks at the root or HTML element for *font-size* . So, we don't need to worry about parent-child calculations as with *em* . use *em* with *padding* as em will adjust the padding based on the font-size of that element. use *rem* with *margin* if you want consistent space among all the adjacent elements.

@chrisclinejax 5 лет назад

you have a gift for making that "ah that makes sense" moment happen

@mohamedelidrissi9914 2 года назад

every damn time i think "why would i ever need that" then i go "AH!"

@pemadechen9901 5 лет назад

Sir, you are a blessing to us..

@ne9835 3 года назад

Agreed!!

@jcpartri 3 года назад

I agree. :-)

@mayurravindra9433 3 года назад

Indeed😌

@franksolinsky2365 Год назад

Hi Kevin, I'm just finishing day 2 of the course and I wanted to take a moment to thank you for offering this free content. I have been really struggling to understand responsive design and decided to find a way to make it click. Likewise, I have always found your content helpful and concise before, making it easy to turn to you for instruction now. I have got to say, in the two short lessons so far, it's already making so much more sense. You're the best!

@SazikimiJaeger 5 лет назад

Seriously having nightmares with rems and ems. But no more. The nightmare is over Thanks to you. Great tutorial again, right up to the point along with simple explanation. 😀😀😀

@KevinPowell 5 лет назад

Glad I could help!

@rashujain6813 2 года назад

@@KevinPowell talk about deep nested comments

@tnblackdragongamingofficia6163 2 месяца назад

@@rashujain6813 this is kevin powell alt account - will do

@avimishra8263 Год назад

I am watching this after 5 years since the video got released and still its the best video on rem and em in youtube

@Anonymouspock 5 лет назад

That is some extremely interesting colour grading at the start.

@taariqq 4 года назад

Small chunks of information, followed by enough practice, makes the concept stick. Thanks for that 'drip content' style course on responsive layouts. It is helping immensely!

@daniamsalem 4 года назад

I'm on your Conquering Responsive Layouts course and I learned so much from this one video. At the agency where I build WordPress templates, I'm used to building websites for desktops and then using media queries to resize designs for mobile devices. But now, my whole mindset has changed. Your use of media queries to change `html` font size with minimal changes to child elements and their font size and padding is epic!

@eduardoomar8213 2 года назад

Instablaster...

@lennoxgilbert4968 2 года назад

You are truly a godsend; such clear and succinct explanations and examples. Thank you so much, Kevin!

@abdullahzeeshan4516 4 года назад

I'm new to this channel and i just love that different css things that not much of the people explain are explained by him (just loved it)

@johnnysausage835 5 лет назад

This channel is a gift, superb job thanks a lot Kevin

@aneidlin 4 года назад

You and your videos are probably the best teacher and resources I've found to really learn and understand what's happening with CSS. What they teach you in school or in books doesn't explain the nuances that you're going to need to know when you're developing real-world applications. Thank you so much for everything you do and for being such a boon to those of us who are looking to level up our skills quickly while also developing that deeper understanding!

@JohnMcCormack 5 лет назад

Excellent and thorough explanation of em versus rem. Thank you.

@flaminggasolineinthedarkne4 2 года назад

When I was struggling with css3 margin and padding, I wish I would have watched this video at that time. That's so amazing and informative sir Kevin Powell. You are a genius.

@mattshirlaw3092 Год назад

Very underrated video… still to this day the best explanation of em/rem I’ve seen. Thank you 🙏

@ericka606 2 месяца назад

Thank you Kevin, taking your responsive layouts course now and wanted to be thorough. Had an aha moment so glad I came to check this out.

@GauthamHC99 3 года назад

this saves us from media query to a great extent 🙏. Thanks Kevin.

@kevinbegin3049 3 года назад

Thank you for all these tutorials. Every single one rocks! Super helpful!

@petarkolev6928 2 года назад

Kevin, you are amazing mentor! Each video of yours gives me "aha" moment and the insane to this is I code for 4 years now and still I have so many misunderstandings and you bring brightness to me with every video

@Doraphobic Год назад

Kevin your content is SO HELPFUL!

@marie-elizeventer7080 Год назад

Thanks! I have been watching video's about EM and REM forever, and I never understood it until today. Great tutorial, great examples.

@diegofergusson9113 2 года назад

I was seeing your course of responsive with ccs and sir you are amazing, thanks you, you help me a lot !

@iDarkBladei2 4 года назад

Such a good video! Now i not only understand the difference between them, but also when should or shouldn't i use each of them. Very helpful, thank you :)

@jakeperl5857 2 года назад

5 yrs on and the best explanation I've seen on this topic... for the first time I finally get it...thank you!

@memoryman51 4 года назад

I finally feel like I have a handle on this topic. Great explanation. Thanks!

@guillermoandradaFSD 3 года назад

It's just amazing... You explain us, and it's easy to understand everything. Thank you so much... Love it...

@bekjohansson3016 3 года назад

Outstanding job on explaining, em and rem and why and how to use them!

@dishantsharma8614 3 года назад

Such an amazing explanation of em vs rem. great job sir.

@SamCrowetheCreativeCrowe Год назад

Experiencing some real stress with a "simple" landing page build out for an existing page. In media query hell yet but finding this and the 21 day challenge course to be very rewareding and useful. Kevin Powell is a trusted resource fo CSS. I am a big fan and even bought the hoodies!

@rpf23543 Год назад

Awesome! You’re really doing the best html, css Tutorials out there. Thank you so much!!!

@start-media 2 года назад

This is the best explanation I’ve seen so far. Watching your tips saves years of lifetime 😊

@Tridentus Год назад

I can't believe I even ever tried to build anything ever without watching this video. How stupid was that? 😆 17 minutes that could have saved me weeks of my life.

@climb.and.wander 2 года назад

Great video about explaining the differences between rems and ems. For those, like me, who like to know to what actual pixels the relative values turn into, the computed values in devtools and/or just inspecting an element can give some confidence about that. Another important aspect of giving relative font-sizes is to support accessibility. If a user has different browser settings for default font-size, the font-sizes in pixels won't adapt. These are just some thoughts that came up while watching the video. Some may find it useful. Cheers!

@chanm01 4 года назад

...okay. That single media-query thing at the end sold me. I can see that being used all the time. 😮

@AshishSingh-he2qo 4 месяца назад

1. Font-size: rem to fixed 2. Padding: em because it see the element font size 3. Margin: rem to fixed the margin gap

@CodingCompanion-zr6vu 3 месяца назад

em is basically there to fu(k things up

@aspsa6246 3 года назад

Well done, Kevin. Very concise and clear.

@merictunc Месяц назад

Finally, someone has made a clean and practical explanation of what REM and EM. 🎉 thanks for sharing

@RaoulUnger 4 года назад

Excellent video, thanks for clarifying this once and for all. The codepen is really helpful too!

@mkajiwala1 3 года назад

great explation ,just started your course -challenge , this presentation will certainly helpful ! this speaks your experience of so many years......

@FredSq День назад

this is incredible, even after 7 years

@z40140110 2 года назад

simple but extremely concept , thank you so much for delivering it

@ElenaYavorskaya 3 месяца назад

Amazingly useful video!! Thank you sooooo much!!!

@amrobbie 2 года назад

Amazingly helpful - thank you Kevin!

@surendrababuchalla 2 года назад

First time saw practical use of em and rem in case study example. Thank you sir

@GGdevelopment 4 года назад

I've gotten 3 recommended videos from from you by RU-vid and they were what I was looking for. Haha +1 sub

@KevinPowell 4 года назад

Welcome aboard! Glad that RU-vid is pointing you in the right direction (though it's also sometimes a bit scary, lol)

@l_bonza7555 6 лет назад

Best explanation! Keep it up. Love your way of explaining things

@KevinPowell 6 лет назад

Thanks so much, glad you liked the vid :)

@fabriziofilograna6498 3 года назад

this is going to change my game! thank you Kevin

@Alexis-fw5zj Год назад

Thank you so much! I really appreciate you sharing your knowledge and making things easier to understand

@RahulSharma-ox6se 3 года назад

That was super helpful. Thank you so much, Kevin!!

@hakanviajando Год назад

You are a CSS geniues, I'm following the Conquest Responsive Layouts course and thinking about that html and css is responsive by default, but we break it with rules is amazing. great perspective. Thanks for all the work.

@JocelynAlsdorf 11 месяцев назад

6 years later and this content is still so helpful :)

@doctorartiste2905 Год назад

CRL - Day 2 CSS em and rem explained! Learning so much already. TY KEVIN!!!

@shecodes94623 2 года назад

This channel has an amazing energy and awesome content... thankssss

@mizanurrahmankhan692 5 лет назад

Man, I have fallen in love with your channel. Thanks for making awesome videos.

@KevinPowell 5 лет назад

Glad that you're enjoying my content!

@KenzoArts 4 года назад

Hello Kevin ! I like your clear explanation on most confusing css properties. Could you please make a video about 'calc' function in CSS, how and when to use it. Thanks

@darabumdarabum 2 года назад

I have been using pixels and a thousand media queries, one for each element and subelement, in order to scale the fonts up and down. No more. I was always afraid of using Ems and Rems and this is the first time I feel like I understand them. Thank you!

@clevermissfox 8 месяцев назад

Cant wait to actually understand when to use which... love this channel!

@abdulraffy5398 2 года назад

Useful video. I finally get a sound reason to use em and rem. I have used px all the time but from now on I will use em and rem

@knotcircle2844 2 года назад

Thanks to this video. I always use rem coz I was in a rush to learn things back then. I now know when to use em instead of rem. Some takeaways 6:41 - the difference of using margins from padding 12:48 - onto pixels

@markbarton6845 3 года назад

Great video Kevin, thanks!

@aurimasgedvilas4460 6 месяцев назад

This video helped me greatly, thank you Kevin :)

@Razax7 Год назад

You made it extremely easy for me. Thank you!

@alejandrorestrepo2978 6 лет назад

thank you so much for your video, it really helped me put things into perspective. The use of ems and rems really makes a difference to the mobile friendly design and I've never seen it explain as well as in this video, so thanks for posting this video..

@KevinPowell 6 лет назад

No problem at all!

@stormbytes Год назад

Very well explained. Thank you!

@pika7037 6 лет назад

Please make a video on - ::before and ::after ( I really don't understand this thing ) and also make a video on - transform and translateX and translateY and also make a video on absolute, relative position in css and also make a video on linear gradient and also make a video on - Explain overflow concepts and Sorry for so much videos but Kevin you explain very well and you are the world's best teacher in the world...I love my teacher Kevin ( Honestly from heart ) - I love you and thank you so much

@KevinPowell 6 лет назад

Glad you're enjoying my videos Mahendra! Don't watch too many of them at once, take some time to practice what you're learning! I actually have quite a few of your suggestions on my list! A video on ::before and ::after should be coming out in a few weeks, and I have something for absolute and relative as well. Thanks for the suggestions though, I'll add the others to my list :)

@aCitizenJOSerased 3 года назад

Awesome video! Thank you Kevin.

@juan-pablobotero4609 3 года назад

You are such a clever guy 💪. Thanks for taking the time to create this video and sharing your knowledge.

@jawad9757 4 года назад

I never took the time to understand em and rem and I've never bothered to use them so thank you for creating this video

@Developism 2 дня назад

You nailed the explanation!

@arigrafik Год назад

Great way to explain em and rem Thank you so much!

@DjCtavia 2 года назад

Still very useful content, glad to see that video, never too late!

@lmd4881 2 года назад

oh my goodness!!!!!!!!!! BE GONE dubious-looking-buttons -on-small-screen-sizes I flat out had no idea that ems are the magic behind perfect buttons, thank you soooo much Kevin :) :)

@martunjaykumar752 2 года назад

For the 1st time ever, I understood em and rem, how it works.

@jakke1975 2 года назад

Thanks for yet another fantastic explanation.

@ForeverChip03 4 месяца назад

You are the man. Good work 👍👍

@squdge 3 года назад

Fantastic resource, thank you.

@rojingharooni821 Год назад

you are absolutely the definition of WONDERFULL.good you are on this planet

@sexymeal2427 Год назад

Incredible. Wish I found your css tutorials sooner

@david2am 2 года назад

Thanks to you I can understand and apply em and rem, I love to see your videos, God bless you

@philippaubert2947 2 года назад

Thanks for doing this :) I'm learning so much !!

@rontripiano6337 2 года назад

I am in the middle of learning front-end coding and WOW - I'm was confused. Now, I get it. Thanks, A Lot.

@marcocarcini 2 года назад

Very clear explanation

@TheCocoaDaddy 2 года назад

Very useful video!!!! I'm taking the responsive layouts course now and just watched this video! Thanks for posting!!!!! Ok, back to the course. :)

@bischoffdev 2 года назад

I finally understand it now! Thank you!

@jelenatrifkovic5567 Год назад

Nice explanation!

@goutamprasadmohapatra6363 2 года назад

That's a very detailed explanation thankyou sir

@oncalldev Год назад

Great explanation.

@mauricioramirez2855 2 года назад

Thank you so much Kevin, very useful the video!!

@tapaschakraborty4372 Год назад

nice informative video Kevin

@FrenchinPlainSight 5 лет назад

Thanks man. This is really clear. It's gonna take some playing around to really sink in but I can see awesome benefits to this. Do you use percentages for widths and heights or is there still a case for using ems, rems, px in responsive design?

@truthhorizon5851 3 года назад

for width and heights use % or vh and vw

@marinicamashinica Год назад

Excellent explanation with great examples, you're truly a talented lecturer! Sorry for bad English and going a bit off-topic, but I'm so excited and motivated after watching this video and having a revelation on CSS units, I just had to share my feelings; you remind me very much of my "live" teacher in my Front-end education program, who is an excellent, knowledgable and passionate top-tier teacher, just like you are; I think it is really challenging to make such great content in such a short time, and still maintaining fantastic feedback from your viewers, or should I say, students, which of course means people are *actually* learning so so very much, and feeling motivated, happy and engaged while going through all these amazing lectures... So you most definitely are succeeding in making CSS less frustrating, more exciting and even "fall-in-loveable"! 😄 To you and all other developers who are so dedicated to share their knowledge with the world, THANK YOU from the bottom of my heart, you are the greatest, and you are making the teaching profession proud! ♥

@joshcharlottesville 3 года назад

This channel might make me change my life and become a better coder.

@efraimdeluxe 4 года назад

Great explanation!

@hulksunil 3 года назад

Thank you very much for the explanation.

@shireenedwar2757 3 года назад

really thank you very very very much , these videos made me understand ,, without it i was lost , thank you really because you love what you do and illustrate each detail