neon button css code example

Example 1: css glow effect

div {
    width: 150px;
    height: 150px;
    background-color: #fff;

    box-shadow: 120px 80px 40px 20px #0ff;
    /* in order: x offset, y offset, blur size, spread size, color */
    /* blur size and spread size are optional (they default to 0) */
}

Example 2: neon button css

<!--HTML CODE: -->
<a href="#">
	<span></span>
	<span></span>
	<span></span>
	<span></span>
	Neon Button
</a>
<!-- CSS CODE : -->

body 
{
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #031321;
    font-family: consolas;
}

a
{
    position: relative;
    display: inline-block;
    padding: 15px 30px;
    color: #e61062;
    text-transform: uppercase;
    letter-spacing: 4px;
    text-decoration: none;
    font-size: 24px;
    overflow: hidden;
    transition: 0.2s;
}
a:hover
{
    color: #ffffff;
    background: #e61062;
    box-shadow: 0 0 10px #e61062, 0 0 40px #e61062, 0 0 80px #e61062;
    transition-delay: 1s;
}
a span
{
    position: absolute;
    display: block;
}
a span:nth-child(1)
{
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg,transparent,#e61062);
}
a:hover span:nth-child(1)
{
    left: 100%;
    transition: 1s;
} 
a span:nth-child(2)
{
    bottom: 0;
    right: -100%;
    width: 100%;
    height: 2px;