html {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
}

.main_content { 
  display: flex;
  flex: 1;
  text-align: center;
  background-image: url("../img/works_background.jpg");
  background-size: cover;
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.works {
  margin-left: 1rem;
  margin-right: 1rem;
}

h1 {
  padding: 2rem;
  font-size: 1.5rem;
}

.thumbnail {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: center;
}

.gallery, .cafe, .portfolio, .rock-paper-scissors, .omikuji, .to_do {
  display: flex;
  align-items: center;
  
}

.pc {
  width: 300px;
}

.tablet {
  width: 200px;
}

.phone {
  width: 100px;
}