style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  .page {
    display: flex;
    flex-wrap: wrap;
  }
  
  .section {
    width: 100%;
    height: 300px;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  .menu {
    background-color: #5995DA;
    height: 80px;
  }
  
  .header {
    background-color: #B2D6FF;
  }
  
  .content {
    background-color: #EAEDF0;
    height: 600px;
  }
  
  .sign-up {
    background-color: #D6E9FE;
  }
  
  .feature-1 {
    background-color: #F5CF8E;
  }
  
  .feature-2 {
    background-color: #F09A9D;
  }
  
  .feature-3 {
    background-color: #C8C6FA;
  }
  
  /* Mobile Styles */
  @media only screen and (max-width: 400px) {
    body {
      background-color: #F09A9D; /* Red */
    }
  }
  
  /* Tablet Styles */
  @media only screen and (min-width: 401px) and (max-width: 960px) {
    .sign-up,
    .feature-1,
    .feature-2,
    .feature-3 {
      width: 50%;
    }
  }
  
  /* Desktop Styles */
  @media only screen and (min-width: 961px) {
    .page {
        width: 960px;
        margin: 0 auto;
      }
      .feature-1,
      .feature-2,
      .feature-3 {
        width: 33.3%;
      }
      .header {
        height: 400px;
      }
      .sign-up {
        height: 200px;
        order: 1;
      }
      .content {
        order: 2;
      }
  }