mdb-ui-kit/sass/_buttons.scss

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

    &:hover {
        @extend .shadow-z-5;
    }

}

.btn {
    position: relative;
    padding: 8px 30px;
    border: 0;
    margin: 10px 1px;

    cursor: pointer;
    border-radius: 4px;
    text-transform: uppercase;
    text-decoration: none;
    color: $darkbg-text;

    &:hover {
        color: $darkbg-text;
    }
    &:hover:not(.btn-link) {
        @extend .shadow-z-2-hover;
    }
    transition: box-shadow 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    &:active:not(.btn-link) {
        @extend .shadow-z-3;
    }
    outline: none !important;
}
// This is needed to style buttons which has not a variation suffix (they must 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 {
    &:hover {
        background-color: rgba(255,255,255,0.5);
    }
}

.btn-raised {
    @include btn-shadow();
}

.open > .dropdown-toggle.btn {
    //.variations(#{""}, background-color, $btn-default);
}
.btn-flat {
    box-shadow: none !important;
    &.btn-default:hover {
        background: none;
    }
}

.btn-group, .btn-group-vertical {
    position: relative;
    border-radius: 4px;
    margin: 10px 1px;

    @include btn-shadow();
    &.open .dropdown-toggle {
        box-shadow: none;
    }
    &.btn-group-raised {
        @include btn-shadow();
    }
    .btn, .btn:active, .btn-group {
        box-shadow: none !important;
        margin: 0;
    }
    .btn:active .caret { margin-left: -1px; }
}
.btn-group-flat {
    box-shadow: none !important;
}

// Floating Action Button (FAB)

.btn-fab {
    margin: 0;
    padding: 15px;
    font-size: 26px;
    width: 56px;
    height: 56px;
    &, &:hover {
        //.variations(#{""}, background-color, transparent);
    }
    &, .ripple-wrapper {
        border-radius: 100%;
    }
    &.btn-mini {
        width: 40px;
        height: 40px;
        padding: 13px;
        font-size: 15px;
    }
}

// Alert buttons
// --------------------------------------------------

.btn-default {
  @include button-variant($btn-default);
}
.btn-primary {
  @include button-variant($primary);
}
// Success appears as green
.btn-success {
  @include button-variant($success);
}
// Info appears as blue-green
.btn-info {
  @include button-variant($info);
}
// Warning appears as orange
.btn-warning {
  @include button-variant($warning);
}
// Danger and error appear as red
.btn-danger {
  @include button-variant($danger);
}

// Material shades
.btn-material-red {
    @include button-variant($red)
}
.btn-material-pink {
    @include button-variant($pink);
}
.btn-material-purple {
    @include button-variant($purple);
}
.btn-material-deeppurple {
    @include button-variant($deeppurple);
}
.btn-material-indigo {
    @include button-variant($indigo);
}
.btn-material-lightblue {
    @include button-variant($lightblue);
}
.btn-material-cyan {
    @include button-variant($cyan);
}
.btn-material-teal {
    @include button-variant($teal);
}
.btn-material-lightgreen {
    @include button-variant($lightgreen);
}
.btn-material-lime {
    @include button-variant($lime);
}
.btn-material-lightyellow {
    @include button-variant($lightyellow);
}
.btn-material-orange {
    @include button-variant($orange);
}
.btn-material-deeporange {
    @include button-variant($deeporange);
}
.btn-material-grey {
    @include button-variant($grey);
}
.btn-material-bluegrey {
    @include button-variant($bluegrey);
}
.btn-material-brown {
    @include button-variant($brown);
}
.btn-material-lightgrey {
    @include button-variant($lightgrey);
}