.presentation__main {
    /*box*/
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding-top:20px;
    width:calc(100% - 250px);
    margin-left:20px;
}

.presentation__main.is-text .presentation__main__slide{
    /*box*/
    cursor: crosshair;
}