.button {
    outline: 0;
    border: 0;
    padding: 0.5em 1em;
    border-radius: 0.1em;
    cursor: pointer;
    background: var(--red);
    color: #fff;
    border: 1px solid rgba(0,0,0,.05);
    -webkit-box-shadow: 0 0 5px rgba(0,0,0,.05);
    box-shadow: 0 0 5px rgba(0,0,0,.05);
    -webkit-transition: all .1s ease;
    transition: all .1s ease;
}
.button:hover {
    background-color: var(--dark-red);
}
.button--flat.button--grey {
    color: yellow;
}