.para1 {
    /* The image used */
    background-image: url("/images/para2.jpg");

    /* Set a specific height */
    height: 300px;

    /* Create the parallax scrolling effect */
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}

.hided{
    display:none;
}