.container {
    width: 75%;
    margin: 0 auto;
}

.container .columns {
    float: left;

    margin: 0 0 0 0;
    padding: 0 .5em;

    text-align: center;
}



.clear:before,
.container:after,
.row:after,
.row:before,
.container:before,
.clear:after {
    display: table;

    content: ' ';
}

.container:after,
.row:after,
.clear:after {
    clear: both;
}

.container {
    position: relative;
}


.gallery {
    position: absolute;
    top: 67.8%;
    left: 41.5%;
    z-index: 2000
}

.sea {
    position: absolute;
    top: 50%;
    left: 27.2%;
    z-index: 2000
}

.history {
    position: absolute;
    top: 27.8%;
    left: 41.5%;
}

.air {
    position: absolute;
    top: 50%;
    left: 55.4%;
}

.glass {
    position: absolute;
    /* Изначально скрыто */
    display: none;

    width: 250px;
    height: 250px;

    cursor: crosshair;

    border-radius: 50%;
    /* Создание эффекта стекла */
    box-shadow: 0 0 0 7px rgba(255, 255, 255, .85),
    0 0 7px 7px rgba(0, 0, 0, .25),
    inset 0 0 40px 2px rgba(0, 0, 0, .25);
}