style.css

body {
    background: whitesmoke;
  }
  
  
  
  .navbar {
    margin-right: 0px;
    margin-left: 0px;
    padding: 25px;
    background: skyblue;
  }
  .home-button {    
    margin-right: 5px;
    margin-left: 5px;
    background: blue;
  }
 
  .navbar li {
    display: block;
    padding: 8px;
    cursor: pointer;
  }
  h1 {
    font-size: 35px;
  }
  h2 {
    font-size: 35px;
  }
  
  
  p{
      font-size: 20px;
  }
  
  
  
  @media (max-width: 600px) {
    .navbar li {
      padding: 10px;
    }
    .navbar ul {
      visibility: hidden;
    }
    #nav-select {
      visibility: visible;
    }
  }
  
  
  .col-1 {width: 8.33%;}
  .col-2 {width: 16.66%;}
  .col-3 {width: 25%;}
  .col-4 {width: 33.33%;}
  .col-5 {width: 41.66%;}
  .col-6 {width: 50%;}
  .col-7 {width: 58.33%;}
  .col-8 {width: 66.66%;}
  .col-9 {width: 75%;}
  .col-10 {width: 83.33%;}
  .col-11 {width: 91.66%;}
  .col-12 {width: 100%;}
  
  @media only screen and (max-width: 600px) {
      
      [class*="col-"] {
          width: 100%;
      }
  
}