.presentation__main__slide {
    /*box*/
    position:relative;
    width:900px;
    height:506px;
    margin-bottom:20px;

    /*background*/
    background-color: var(--c-tertiary-4);
    -webkit-box-shadow: 0px 1px 4px rgb(0 0 0 / 16%);
    box-shadow: 0px 1px 4px rgb(0 0 0 / 16%);

    /*border*/
    border-radius: 4px;
}

.presentation__main__slide-clone {
    /*box*/
    display: none;
}