$prefix-backtop: #{$prefix}back-top;

.#{$prefix-backtop} {
    z-index: $zindex-back-top;
    position: fixed;
    cursor: pointer;
    display: none;
	$size: 40px;
    text-align: center;
    font-size: $font-size-large;
    &.#{$prefix-backtop}-show {
		display: block;
    }
    &-inner {
        width: $size;
	    height: $size;
        background-color: rgba(0,0,0,.6);
        border-radius: 50%;
        @include get-color-shadow();
        transition: all $transition-time ease-in-out;
        &:hover {
            background-color: rgba(0,0,0,.7);
        }
    }
	i {
        font-size: 28px;
        line-height: $size;
        @include get-color-background-coloured;
	}
}