#menubox_container {
    display: flex;
    flex-wrap: nowrap;
    flex-flow: center;
    width: 100%;
}

.menubox {
    width: 25%;
    transition: all 1s ease-in;
    overflow: hidden;
}

.menubox_info {
    width: 100%;
    font-size: 1.5em;
    font-weight: bold;
    white-space: nowrap;
    padding: 5px 10px;
    color: #069;
    background-color: #f2f2f2;
    opacity: 0.8;
}

.menubox_content {
    position:relative;
    top:100%;
    left:250px;
    padding: 6px 0px 10px 12px;
    font-size: 1.2em;            
    color: #069;
    background-color: #f2f2f2;
    opacity: 0;
    border-radius: 0 0 0 15px;
    transition: all 0.5s ease-out;
}

.menubox_content UL {
    list-style-type: none;
    line-height: 1.6em;
    margin: 0;
    padding: 0;
}

.menubox_content A {
    color: #069;
}

.menubox_content A:hover {
    color: #09c;
}

.menubox, .menubox_rest {
    border-left: solid 1px #f2f2f2;
    height: 300px;
    /*background: #f2f2f2;*/
    margin: 0px;
    padding: 0px;
}

.menubox:hover {
    width: 70%;
    filter: none;
    /*animation: menubox_open 1s ease-in;*/
    transition: all 0.5s ease-in;
}

.menubox:hover .menubox_content {
    opacity: 0.7;
    top: 115px;
    transition: all 0.5s ease-in;
    transition-delay: 0.6s;
}

.menubox_rest:not(:hover) {
    width: 10%;
    transition: all 0.5s ease-out;
    transition-delay: 0.5s;
}

.prvi {
    background-image: url('https://www.fsb.unizg.hr/index.php?type=inline&dir=atlantis/web/sites/fsbonline/banner/520/33/&file=banner.jpg');
}

.drugi {
    background-image: url('https://www.fsb.unizg.hr/index.php?type=inline&dir=atlantis/web/sites/fsbonline/banner/520/49/&file=banner.jpg');
}

.treci {
    background-image: url('https://www.fsb.unizg.hr/index.php?type=inline&dir=atlantis/web/sites/fsbonline/banner/520/42/&file=banner.jpg');
}

.cetvrti {
    background-image: url('https://www.fsb.unizg.hr/index.php?type=inline&dir=atlantis/web/sites/fsbonline/banner/520/50/&file=banner.jpg');
}


.prvi, .drugi, .treci, .cetvrti {
    /*background-attachment: fixed;*/
    background-position: -50px top;
    background-repeat: no-repeat;
    background-size: auto 300px;
    filter: grayscale(30%);/*blur(0.05em);*/
}