body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background-image: url(back.jpg);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.header-box {
    width: 80%;
    margin: 30px auto;
    border: 15px solid red;
    padding: 30px;
    background-color: rgba(255, 255, 255, 0.85);
    text-align: center;
}

.footer-box {
    width: 80%;
    margin: 30px auto;
    border: 5px solid red;
    padding: 15px;
    background-color: rgba(255, 255, 255, 0.85);
    text-align: center;
}

.glow {
    font-size: 40px;
    color: red;
    animation: glow 1s ease-in-out infinite alternate;
}

@keyframes glow {
    from {
        text-shadow: 0 0 10px #fff, 0 0 20px #fff;
    }

    to {
        text-shadow: 0 0 20px red, 0 0 30px red;
    }
}

.box-wrapper {
    width: 80%;
    margin: auto;
    display: flex;
    justify-content: space-between;
}

.prvi,
.drugi {
    width: 48%;
    background-color: lightgrey;
    border: 5px solid red;
    padding: 25px;
    box-sizing: border-box;
}

img {
    width:500px;
}

.video-section {
    width: 80%;
    margin: 40px auto 80px auto;
    text-align: center;
}

.video-section video {
    width: 100%;
    border: 8px solid red;
}

#slider {
    position: relative;
    overflow: hidden;
    margin: 20px auto 0 auto;
    border-radius: 4px;
}

#slider ul {
    position: relative;
    margin: 0;
    padding: 0;
    height: 200px;
    list-style: none;
}

#slider ul li {
    position: relative;
    display: block;
    float: left;
    margin: 0;
    padding: 0;
    width: 500px;
    height: 300px;
    background: #ccc;
    text-align: center;
    line-height: 300px;
}

a.control_prev,
a.control_next {
    position: absolute;
    top: 40%;
    z-index: 999;
    display: block;
    padding: 4% 3%;
    width: auto;
    height: auto;
    background: #2a2a2a;
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    font-size: 18px;
    opacity: 0.8;
    cursor: pointer;
}

a.control_prev:hover,
a.control_next:hover {
    opacity: 1;
    -webkit-transition: all 0.2s ease;
}

a.control_prev {
    border-radius: 0 2px 2px 0;
}

a.control_next {
    right: 0;
    border-radius: 2px 0 0 2px;
}

.slider_option {
    position: relative;
    margin: 10px auto;
    width: 160px;
    font-size: 18px;
}