styles.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
/* Menus Stuff */

  .menu-container {

    display: flex;
    justify-content: center;

    color: #fff;
    background-color: #5995DA;  /* Blue */
    padding: 20px 0;
  }
  
  .menu {
    border: 1px solid #fff;
    width: 900px;
    display: flex;
    justify-content: space-around;
  }

/* Header stuff */

  .header-container {
    color: #5995DA;
    background-color: #D6E9FE;
    display: flex;
    justify-content: center;
  }
  
  .header {
    width: 900px;
    height: 300px;
    display: flex;
    justify-content: space-between;
    align-items: center;  /* Add this */
  }

/* Photo grid stuff */

  .photo-grid-container {
    display: flex;
    justify-content: center;
  }
  
  .photo-grid {
    width: 900px;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    flex-direction: column;
    flex-direction: row;
    align-items: center; 
  }

  .first-item {
    order: 1;
  }
  
  .last-item {
    order: -1;
  }

  
  .photo-grid-item {
    border: 1px solid #fff;
    width: 300px;
    height: 300px;
  }
/* Footer stuff */

.footer {
    display: flex;
    justify-content: space-between;
  }
  
  .footer-item {
    border: 1px solid #fff;
    background-color: #D6E9FE;
    height: 200px;
    flex: 1;
  }

  .footer-one,
  .footer-three {
    background-color: #5995DA;
    flex: initial;
    width: 300px;
  }