[class*="col"] {
       margin-bottom: 20px; 
       margin-top: 20px;
   }

img { width: 100%; }

body { margin-top: 100px; }
.parallax {
    /* The image used */
    background-image: url("img/boucherie.jpg");

    /* Set a specific height */
    padding-top: 50px;
    min-height: 700px;
    min-width: 100%;
    /* Create the parallax scrolling effect */
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}
.parallax2 {
    /* The image used */
    background-image: url("img/Shooting-Boucherie-27.jpg");

    /* Set a specific height */
    padding-top: 50px;
    min-height: 700px;
    min-width: 100%;
    /* Create the parallax scrolling effect */
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}
.parallax3 {
    /* The image used */
    background-image: url("img/boucherieinside.png");

    /* Set a specific height */
    padding-top: 50px;
    min-height: 500px;
    min-width: 100%;
    margin-bottom: 50px;
    /* Create the parallax scrolling effect */
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}
.parallax4 {
    /* The image used */
    background-image: url("img/roti.jpg");

    /* Set a specific height */
    padding-top: 50px;
    min-height: 500px;
    min-width: 100%;
    margin-bottom: 50px;
    /* Create the parallax scrolling effect */
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}