.btn {
    display: inline-block;
    padding: 0.9em 2.1em;
    margin-right: 1em;
    margin-bottom: 1em;
    font-size: 18px;
    line-height: 1em;
    text-transform: uppercase;
    text-decoration: none;
    color: #fff;
    background-color: #649;
    border: 0.1em solid #649;
    border-radius: 1.5em;
    box-shadow: 0 4px 8px #7778;
    transition: all 0.3s;
}
.btn:hover {
    background-color: #fff;
    color: #649;
    box-shadow: 0 4px 12px #0008;
}

.btn.btn-white {
    background-color: #fff;
    color: #649;
}
.btn.btn-white:hover {
    background-color: #649;
    color: #fff;
}