body {
}

.btn-default {
    box-shadow: 1px 2px 5px #000000;
}

.btn-round {
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

    .btn-round.btn-lg {
        width: 48px;
        height: 48px;
    }

    .btn-round.btn-sm {
        width: 34px;
        height: 34px;
    }

    .btn-round.btn-xs {
        width: 24px;
        height: 24px;
    }