*
{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

section {
    position: absolute;
    width: 100%;
    height: 100vh;
    display: flex;
    border: 2px solid #000;
}

section .slide
{
    position: relative;
    height: 100%;
    flex: 1;
    border-right: 2px solid #000;
    overflow: hidden;
    transition: .5s ease-in-out;
    opacity: .5;
}

section .slide:last-child
{
    border-right: none;
}

section .slide:hover
{
    flex-grow: 5;
    opacity: 1;
}

@media (max-width: 770px)
{
    section
    {
        display: block;
    }
    section .slide
    {
        display: flex;
        justify-content: center;
        align-items: center;
    }
}