.page {
  display: flex;
  flex-wrap: wrap;
}

.section {
  width: 100%;
  
  display: flex;
  justify-content: center;
  align-items: center;
}

.menu {
  background-color: #5995DA;
  height: 40px;
}

.header
{
    background-color: #FFFFFF;
    height: 100px;
}

.content {
  background-color: #EAEDF0;
  height: 600px;
}

.sign-up {
  background-color: #D6E9FE;
}

.feature-1 {
  background-color: #F5CF8E;
  height: 300px;
}

.feature-2 {
  background-color: #F09A9D;
  height: 300px;
}

.feature-3 {
  background-color: #C8C6FA;
  height: 300px;
}

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

/* 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) 
{
  body 
  {
    background-color: #F5CF8E; /* Yellow */
  }
  .sign-up,
  .feature-1,
  .feature-2,
  .feature-3 
  {
    width: 50%;
  }
  
}

/* Desktop Styles */
@media only screen and (min-width: 961px) 
{
  body
    {
        background-color: #CCFFCC; /* Blue */
    }
  
  .page 
  {
    width: 960px;
    margin: 0 auto;
  }
  .feature-1,
  .feature-2,
  .feature-3 
  {
    width: 33.3%;
  }
  .header 
  {
    height: 100px;
  }
  
  .sign-up 
  {
  height: 200px;
  order: 1;
  }
.content 
  {
  order: 2;
  }
  
}







.photo-grid-container {
  display: flex;
  justify-content: center;
}

.photo-grid {
  width: 900px;
  display: flex;
  justify-content: flex-start;
}

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