* {
    box-sizing: border-box;
}

body {
    background-color: #f1f1f1;
    padding: 20px;
    font-family: Arial;
}

/* Center website */
.main {
    max-width: 1000px;
    margin: auto;
}

h1 {
    font-size: 50px;
    word-break: break-all;
}

.row {
    margin: 10px -16px;
}

    /* Add padding BETWEEN each column */
    .row,
    .row > .column {
        padding: 8px;
    }

/* Create three equal columns that floats next to each other */
.column {
    float: left;
    width: 33.3%;
    display: none; /* Hide all elements by default */
}

/* Clear floats after rows */
.row:after {
    content: "";
    display: table;
    clear: both;
}

/* Content */
.content {
    background-color: white;
    padding: 10px;
}

/* The "show" class is added to the filtered elements */
.show {
    display: block;
}

/* Style the buttons */
.btn {
    border: none;
    outline: none;
    padding: 12px 16px;
    background-color: white;
    cursor: pointer;
}

    .btn:hover {
        background-color: #ddd;
    }

    .btn.active {
        background-color: #666;
        color: white;
    }



/* this si for the big image at the bottom of the page The grid: Four equal columns that floats next to each other */
.column {
    float: left;
    width: 25%;
    padding: 10px;
}

/* Style the images inside the grid */
.column img {
    opacity: 0.8;
    cursor: pointer;
}

    .column img:hover {
        opacity: 1;
    }

/* Clear floats after the columns */
.row:after {
    content: "";
    display: table;
    clear: both;
}

/* The expanding image container (positioning is needed to position the close button and the text) */
.container {
    position: relative;
    display: none;
}

/* Expanding image text */
#imgtext {
    position: absolute;
    bottom: 15px;
    left: 15px;
    color: white;
    font-size: 20px;
}

/* Closable button inside the image */
.closebtn {
    position: absolute;
    top: 10px;
    right: 15px;
    color: white;
    font-size: 35px;
    cursor: pointer;
}