.menu ul{
    margin: 0;
    padding: 0;
    overflow: hidden;}

.menu ul li{list-style-type: none;
    display: inline;
    float: left;}
    
.menu ul li{
        list-style-type: none;
        display: inline;
        float: left;}

.kolonka1{
    text-decoration: none;
    background-color: bisque;
    display: block;
    text-align: center;
    padding: 14px 16px;}


.kolonka2 {
    text-decoration: none;
    background-color: aquamarine;
    display: block;
    text-align: center;
    padding: 14px 16px;
} 
.kolonka3 {
    text-decoration: none;
    background-color: brown;
    display: block;
    text-align: center;
    padding: 14px 16px;
} 
.kolonka4 {
    text-decoration: none;
    background-color: tomato;
    display: block;
    text-align: center;
    padding: 14px 16px;
} 
@media screen and (max-width :900px) {
    .kolonka1
    .kolonka2
    .kolonka3
    .kolonka4
    {
     display: block;   
        
     flex: 100%
    }
}