Linear gradient is not working with <a> element [duplicate] - html

Question

This question already has answers here:
What are valid values for the id attribute in HTML?
(26 answers)
Closed 4 years ago.
I am trying to apply CSS gradients to my <a> elements. It clearly doesn't work and I've been trying to work it out with no success. I am using Chrome if it has to do anything with the issue.
body {
margin: 1cm;
}
a {
padding: 15px 60px 15px 60px;
text-decoration: none;
border: 1px solid black;
}
#1button {
background: rgb(2, 0, 36);
background: linear-gradient(65deg, rgba(2, 0, 36, 1) 0%, rgba(12, 12, 125, 1) 35%, rgba(0, 212, 255, 1) 100%);
}
#2button {
background: rgb(2, 0, 36);
background: linear-gradient(65deg, rgba(2, 0, 36, 1) 0%, rgba(232, 51, 55, 1) 35%, rgba(241, 95, 223, 1) 100%);
}
<a id="1button">Button #1</a>
<a id="2button">Button #2</a>

Answer 1

Don't use a number as the 1st character of your ids:
body {
margin: 1cm;
}
a {
padding: 15px 60px 15px 60px;
text-decoration: none;
border: 1px solid black;
}
#button1 {
background: linear-gradient(65deg, rgba(2, 0, 36, 1) 0%, rgba(12, 12, 125, 1) 35%, rgba(0, 212, 255, 1) 100%);
}
#button2 {
background: linear-gradient(65deg, rgba(2, 0, 36, 1) 0%, rgba(232, 51, 55, 1) 35%, rgba(241, 95, 223, 1) 100%);
}
<a id="button1">Button #1</a>
<a id="button2">Button #2</a>