.back-color:hover {
    background-color: gainsboro;
}

a.btn {
    width: 140px;
    max-width: 250px;
}

.btn, .btn:hover {
    letter-spacing: 1px;
    font-weight: 500;
    padding: 5px 6%;
    border-radius: 5px;
    border: 1px solid !important;
}