<button></button>
body {
display: flex;
justify-content: center;
margin: 0;
height: 100vh;
background: linear-gradient(#f8f8f8, #d9d9d9);
}
button {
align-self: center;
border: none;
padding: .375em;
width: 2.25em; height: 2.25em;
border-radius: 50%;
box-shadow: 0 .375em .5em -.125em #808080,
inset 0 -.25em .5em -.125em #bbb;
background: linear-gradient(#c5c5c5, #efefef)
content-box,
linear-gradient(#fdfdfd, #c4c4c4);
font-size: 1.5em;
cursor: pointer;
&:active { transform: translateY(1px); }
}
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