.reveal {
    position: relative;
    overflow: hidden;
}

/*initial - hidden*/
.reveal .reveal__cover {
    position: absolute;
    top: 0;
    left: -250px;
    height: 100%;
    margin: 2px;
    width: calc(100% + 250px);
}

.reveal .reveal__cover.reveal__uncovered {
    position: absolute;
    top: 0;
    left: 100%;
    height: 100%;
    width: calc(100% + 250px);
    margin: 2px;
    transition: left 2500ms ease-out 0ms;
}

.reveal__cover-section {
    height: 100%;
    float: right;
    background: #fff;
    width: 2%;
}

.reveal__10 {
    opacity: 0.1;
}

.reveal__20 {
    opacity: 0.2;
}

.reveal__30 {
    opacity: 0.3;
}

.reveal__40 {
    opacity: 0.4;
}

.reveal__50 {
    opacity: 0.5;
}

.reveal__60 {
    opacity: 0.6;
}

.reveal__70 {
    opacity: 0.7;
}

.reveal__80 {
    opacity: 0.8;
}

.reveal__90 {
    opacity: 0.9;
}

.reveal__100 {
    opacity: 1;
    width: 82%;
}