layput

div.prvi {color: #6666ff; float:left; width: 50%; background-color: #66ff66;
 text-align: left; height: 100%}

div.drugi {
    width: 30%;
    text-align: center;
    color: blue; margin-left: 70%; background-image: url("https://en.visitsvalbard.com/dbimgs/for%20skjerm.jpg")}


.header {width: 100%; background-color: red}

.sredina { width: 20%; float: inline-start; margin-left: 50%}