Text on websites can't be read, Font not rendering properly on the websites, Website text on Sinhala 

Hello guys,
In this video, I will demonstrate how to fix the unrecognizable text to readable on some websites
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CSS code
h1{
font-family: Arial, Helvetica, sans-serif;
}
header{
font-family: Arial, Helvetica, sans-serif;
}
h2{
font-family: Arial, Helvetica, sans-serif;
}
label{
font-family: Arial, Helvetica, sans-serif;
}
aside{
font-family: Arial, Helvetica, sans-serif;
}
h3{
font-family: Arial, Helvetica, sans-serif;
}
h4{
font-family: Arial, Helvetica, sans-serif;
}
h5{
font-family: Arial, Helvetica, sans-serif;
}
h6{
font-family: Arial, Helvetica, sans-serif;
}
div{
font-family: Arial, Helvetica, sans-serif;
}
p{
font-family: Arial, Helvetica, sans-serif;
}
a{
font-family: Arial, Helvetica, sans-serif;
}
button{
font-family: Arial, Helvetica, sans-serif;
}
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