section {
    flex: 0 1 100%; 
}

.centerfig {
    max-width: 40%;
}

input[class^="submit"] { 
    width: 25%;
    }

input[type="radio"], input[type="checkbox"]{ 
    transform: scale(1.5); 
}

 html {
    background-size: 0.4%,0.4%,25%,8%,8%;
}

nav a{
    margin-top:1%;
    flex:1 1 35%;
}