horizontal-accordion {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: block;
    overflow: hidden;
    white-space: nowrap;
    vertical-align: top;
    transition: margin-left 0.5s;
}
horizontal-accordion > * {
    vertical-align: top;
    display: inline-flex;
    height: 100vh;
    width: 100vw;
    justify-content: center;
    align-items: center;
    align-content: center;
    flex-wrap: nowrap;
    overflow: hidden;
}