nav {
    background-color: red;
    padding: 2em;
    text-align: center;
}
a {
    font-size: 1.5em;
    background-color: pink;
    padding: 0.5em;
    margin: 0.5em auto;
}
label {
    margin: 1em;
   
}
button {
    background-color: red;
    font-size: 2em;
    padding: 1em;
    border: 1px solid black;
    border-radius: 25%;
}
.okvir {
   margin: 10% 10%;
}