.tile {
    background-size: cover;
    height: 350px;
    position: relative;
  }
      
      #hilda1 {
      background-image: url("../assets/images/hilda/Hilda\ Street\ High\ Res-1.jpg");
      }
      
      #hilda2 {
      background-image: url("../assets/images/hilda/Hilda\ Street\ High\ Res-11.jpg");
      }
      
      #hilda3 {
      background-image: url("../assets/images/hilda/Hilda\ Street\ High\ Res-14.jpg");
      }
      
      #hilda4 {
      background-image: url("../assets/images/hilda/Hilda\ Street\ High\ Res-18.jpg");
      }
      
      #hilda5 {
      background-image: url("../assets/images/hilda/Hilda\ Street\ High\ Res-20.jpg");
      }
      
      #hilda6 {
      background-image: url("../assets/images/hilda/Hilda\ Street\ High\ Res-26.jpg");
      }
      
      #hilda7 {
      background-image: url("../assets/images/hilda/Hilda\ Street\ High\ Res-30.jpg");
      }
      
      #hilda8 {
      background-image: url("../assets/images/hilda/Hilda\ Street\ Low\ Res-13.jpg");
      }
      
      #hilda9 {
      background-image: url("../assets/images/hilda/Hilda\ Street\ Low\ Res-29.jpg");
      }
      
      #hilda10 {
      background-image: url("../assets/images/hilda/Hilda\ Street\ Low\ Res-3.jpg");
      }
      
      #hilda11 {
      background-image: url("../assets/images/hilda/Hilda\ Street\ Low\ Res-4.jpg");
      }
      
      #hilda12 {
      background-image: url("../assets/images/hilda/Hilda\ Street\ Low\ Res-6.jpg");
      }
      
      
  
      @media only screen and (max-width: 350px) {
          .cover-heading {
              font-size: 3em;
          }
        
          .navbar-brand {
            width:50%;
          }
        
          .masthead-brand {
            width:50%;
            height:50%;
          }
        
          .inner img {
            width: 120px;
          }
        }