style.css

html, body {
  margin: 0;
  font-family: "Verdana", Monospace, sans-serif;
  color: #413C58;
}

.container {
  min-height: 100vh;
  background-color: #f1f1f1;
}

.nav {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 40px;
  background-color: #363537;
  display: flex;
  justify-content: space-between;
  box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.15);
}

.nav-logo {
  width: 100px;
  height: 100%;
  cursor: pointer;
  line-height: 35px;
  text-align: center;
  color: #FFC73F;
}

.nav-center {
  display: flex;
}

.feature-button {
  height: 100%;
  width: 50px;
  cursor: pointer;
  line-height: 35px;
  text-align: center;
  background-color: #FFC73F;
}

.content {
  position: absolute;
  top: 40px;
  left: 0;
  right: 0;
  bottom: 0;
  overflow-y: auto
}

.content-body {
  max-width: 600px;
  margin: 20px auto;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

.content-body > * {
  margin: 5px 10px
}

.feature {
  width: 180px;
  height: 140px;
  cursor: pointer;
  font-size: 14px;
  line-height: 125px;
  text-align: center;
  color: #aaa;
  background-color: white;
  border-radius: 3px;
  border: solid white 5px;
  box-sizing: border-box;
  box-shadow: 0 2px 5px 0 rgba(0, 0, 0, 0.15);
  transition: 0.2s
}

.feature:hover {
  color: white;
  background-color: #FFC73F;
  box-shadow: 0 4px 11px 0 rgba(0, 0, 0, 0.15);
  transform: translateY(-2px);
}

.feature-a, .feature-b {
  font-size: 24px;
  color: white;
}

.feature-a {
  background-color: #FF715B;
}

.feature-b {
  background-color: #1EA896;
}