body {
  font-family: Helvetica;
  font-size: 16px;
  line-height: 1.5;
  color: #444444;
  margin: 50px auto 100px auto;
  max-width: 800px;
  text-align: center;
}

header {
  margin: 0 0 50px 0;
}

h1 {
  font-size: 48px;
  line-height: 1.3;
  margin: 0;
}

h2 {
  font-size: 14px;
  font-weight: 400;
  margin: 0;
}

article {
  overflow: hidden;
}

a {
  float: left;
  width: 390px;
  margin: 5px;
  border: 5px solid transparent;
  transition: border-color 0.5s;
}

a.clicked {
  border: 5px solid #ff4141;
}

div.modal {
  display: none;
}

div.modal-background {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  z-index: 1;
}

div.modal-close {
  position: fixed;
  top: 0;
  right: 0;
  padding: 20px 25px 20px 25px;
  z-index: 2;
  cursor: pointer;
  color: white;
  font-size: 12px;
}

div.modal-content {
  position: fixed;
  top: 50%;
  left: 50%;
  width: 780px;
  transform: translateX(-50%) translateY(-50%);
  background: white;
  z-index: 2;
}