body {
    font-family: Arial;
    margin: 0;
}

* {
    box-sizing: border-box;
}

img {
    vertical-align: middle;
}


/* Position the image container (needed to position the left and right arrows) */

.container {
    position: relative;
}


/* Hide the images by default */

.slides {
    display: none;
}


/* Add a pointer when hovering over the thumbnail images */

.cursor {
    cursor: pointer;
}


/* Next & previous buttons */

.prev,
.next {
    cursor: pointer;
    position: absolute;
    top: 40%;
    width: auto;
    padding: 16px;
    margin-top: -50px;
    color: white;
    font-weight: bold;
    font-size: 20px;
    border-radius: 0 3px 3px 0;
    user-select: none;
    -webkit-user-select: none;
}


/* Position the "next button" to the right */

.next {
    right: 0;
    border-radius: 3px 0 0 3px;
}


/* On hover, add a black background color with a little bit see-through */

.prev:hover,
.next:hover {
    background-color: rgba(0, 0, 0, 0.2);
}


/* Number text (1/3 etc) */

.numbertext {
    color: #f2f2f2;
    font-size: 12px;
    padding: 8px 12px;
    position: absolute;
    top: 0;
}

.row:after {
    content: "";
    display: table;
    clear: both;
}


/*Four columns side by side */

.column {
    float: left;
    width: 25%;
}


/* Add a transparency effect for thumnbail images */


/* 
.demo {
    opacity: 0.6;
}

.active,
.demo:hover {
    opacity: 1;
} */