* {
  box-sizing: border-box;
  font-family: "STIX Two Math", serif;
}

html,
body {
  margin: 0;
  padding: 0;
}

.background {
  position: absolute;
  display: block;
  top: 0;
  left: 0;
  z-index: -1;
}

html {
  display: flex;
  justify-content: center;
}

body {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-evenly;
  align-items: center;
}

header {
  width: 100%;
  text-align: center;
}

h1,
h2 {
  margin: 5px;
}

footer {
  margin-top: 25px;
  width: 100%;
  text-align: center;
}

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

section a {
  margin: 10px 20px;
  border-radius: 10px;
  box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.2);
}

section a:hover {
  box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.5);
  transform: translateY(-5px);
  transition: all 0.2s ease-in-out;
}

body > h2 {
  width: 100%;
  text-align: left;
}

section div {
  height: 150px;
  width: 150px;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;

  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  border: 1px solid gray;
  border-radius: 10px;
}

div h2 {
  background-color: rgba(255, 255, 255, 0.5);
  width: 100%;
  margin: 0;
}

@media only screen and (min-width: 600px) {
  body {
    width: 80%;
  }
}