Ejemplo: botón descargar css codepen
<style>
.buttonYN {
margin: 10em auto 0;
display: inline-block;
font-size: 1.15em;
position: relative;
text-align: center;
padding: 0.5em 1em;
background: linear-gradient(45deg, #59adeb, #40c3af);
color: #fff;
box-shadow: 0 0.2em 0.2em rgba(0,0,0,0.25);
border-radius: 0.2em;
transition: box-shadow 0.2s ease-in-out;
cursor: pointer;
}
.buttonYN:active {
background-color: #ccc;
box-shadow: 0 0 6px rgba(0,121,238,0.6);
transition: box-shadow 0.1s ease-in-out;
}
.buttonYN:after {
content: " 021e7";
position: absolute;
top: -0.4em;
left: 0;
right: 0;
display: block;
transform: rotate(180deg);
font-size: 5em;
opacity: 0;
text-shadow: 0 0 1em #000;
transition: opacity 0.3s ease-in-out, font-size 0.3s ease-in-out, top 0.3s ease-in-out;
box-sizing: border-box;
text-align: center;
color: #fff;
}
.buttonYN:active:after {
font-size: 1em;
opacity: 1;
transition: none;
top: 0.3em;
}
.buttonYN:hover {
box-shadow: 0 0.1em 0.25em rgba(0,0,0,0.25);
}
</style>
<div style='margin: 0; padding: 0; text-align: center; font-family: sans-serif;'>
<div class="buttonYN">Download</div>
</div>
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