.header {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 20px;
}
.center {
    text-align: center;
    flex-grow: 1;
}
.center h1 {
    margin: 0;
    line-height: 1.2;
    font-size: 64px;
}
.center h3 {
    margin: 0;
    line-height: 1.2;
    font-size: 48px;
}
.left {
    display: flex;
    align-items: center;    
}
.nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    /* background-color: #333; */
}
.nav li {
    float: left;
    display: inline;
  }
.nav a {
    display: block;
    font-size: 20px;
    padding: 15px;
    background-color: #ffffff;
  }
.home {
    font-size: 20px;
    padding: 15px;
    background-color: #ffffff;
}
.image-container:hover img {
    height: 500px;
  }