button{
    outline: none;
    cursor: pointer;
    display: block;
    overflow: hidden;
    position: relative;
    text-align: center;
    padding: 2em .25em .25em 5em;
    border: none;
    color: #e8644d;
    background-color: transparent;
    font-family: sans-serif;
    font-size: 16px;
    line-height: 1;
    transition: all .2s ease;
    box-shadow: inset 4px 4px 0 0 #e8644d, 1px 1px 0 0 #e8644d;
}

button:hover,
button:focus{
    padding: 2em 1.25em .25em 4em;
}