mdb-ui-kit/less/_buttons.less

.btn {
    position: relative;
    padding: 8px 30px;
    border: 0;
    margin: 10px 1px;
    cursor: pointer;
    border-radius: 2px;
    text-transform: uppercase;
    text-decoration: none;
    color: @darkbg-text;

    &:hover:not(.btn-link):not(.btn-flat) {
        .shadow-z-2-hover();
    }
    &:active:not(.btn-link):not(.btn-flat) {
        .shadow-z-3();
    }
    transition: box-shadow 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    outline: none !important;

    .variations(~".btn-flat:not(.btn-link)", color, @lightbg-text);
	
	.background-variations(~":not(.btn-link):not(.btn-flat)", @btn-default);
	
    &.btn-flat {
        background: none;
        box-shadow: none;
        font-weight: 500;
        &:disabled {
            color: @text-disabled !important;
        }
    }

    &.btn-raised {
        .btn-shadow();
    }

    &.btn-fab {
        margin: 0;
        padding: 15px;
        font-size: 26px;
        width: 56px;
        height: 56px;
        &, &:hover {
            .shadow-z-1();
            .variations(~"", background-color, transparent);
        }
        &, .ripple-wrapper {
            border-radius: 100%;
        }
        &.btn-fab-mini {
            width: 40px;
            height: 40px;
            padding: 13px;
            font-size: 15px;
        }
        i {
            position: relative;
            top: -5px;
        }
    }
}

// This is needed to style buttons which has not a variation suffix (they must be stiled as btn-default)
.btn-link, .btn:not([class^="btn btn-"]), .btn-default {
    color: @lightbg-text;
    &:hover {
        color: @lightbg-text;
    }
}
.btn:not([class^="btn btn-"]), .btn-default, .btn-flat:not(.btn-link) {
    &:hover, &.active {
        background-color: rgba(255,255,255,0.5);
    }
}
.open > .dropdown-toggle.btn {
    .variations(~"", background-color, @btn-default);
}
.btn-group .btn+.btn, .btn-group .btn+.btn-group, .btn-group .btn-group+.btn, .btn-group .btn-group+.btn-group {
  margin-left: 0;
}
.btn-group, .btn-group-vertical {
    position: relative;
    border-radius: 2px;
    margin: 10px 1px;

    .btn-shadow();
    &.open .dropdown-toggle {
        box-shadow: none;
    }
    &.btn-group-raised {
        .btn-shadow();
    }
    .btn, .btn:active, .btn-group {
        box-shadow: none !important;
        margin: 0;
    }
}
.btn-group-flat {
    box-shadow: none !important;
}

.btn-shadow() {
    .shadow-z-2();
    transition: box-shadow 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    &:active:not(.btn-link) {
        .shadow-z-3();
    }
}