.width {
    position: relative;
    max-width: 800px;
    margin: auto;
}

.pics {
    width: 200px;
}
.imgcontainer {
    text-align: center;
}

.ex1_img3 {
    float: right;
}

.ex2_img1 {
    position: absolute;
}

.ex2_img2 {
    position: absolute;
    display: none;
    transition: ease-in-out;
}

.ex2_img1:hover ~ .ex2_img2 {
    display: block;
    right: 0;
}