100 Buttons 007

button{
    position: relative;
    overflow: hidden;
    outline: none;
    cursor: pointer;
    display: block;
    text-align: center;
    border: 2px solid #ac0707;
    letter-spacing: .2em;
    padding: 1em 2em 1em 2.2em;
    color: #FFF;
    background-color: transparent;
    font-family: sans-serif;
    font-weight: 700;
    font-size: 18px;
    text-transform: uppercase;
    line-height: 1;
    transition: all .3s ease;
}

button:focus,
button:hover{
    color: #000;
}

button:after{
    content: "";
    display: block;
    min-width: 200%;
    min-height: 500%;
    border-radius: 50%;
    background-color: #000;
    border: 100px solid #ac0707;
    position: absolute;
    z-index: -1;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    transition: all .3s ease;
}

button:focus:after,
button:hover:after{
    min-height: 0;
    min-width: 0;
}