html, body {
  width: 100%;
}

.main_content {
  text-align: center;
  background-image: url("../img/background.jpg");
  background-repeat: repeat;
}

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

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

h2 {
  text-decoration: underline;
}

.thumbnail {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}

.pc {
  width: 300px;
}

.tablet {
  width: 200px;
}

.phone {
  width: 100px;
}

.works_text {
  margin-top: 2rem;
}

p {
  margin: 2rem;
}

.PC_thumbnail {
  padding: 2rem;
  width: 700px;
}

.tablet_tumbnail, .smartPhone_thmbnail, .tablet-smartPhone_tumbnail {
  display: none;
}

@media(max-width: 768px) {
  .PC_thumbnail {
    display: none;
  }
  .tablet_tumbnail, .tablet-smartPhone_tumbnail {
    display: inline-block;
    width: 500px;
    padding: 2rem;
  }

}

@media(max-width: 576px) {
  .thumbnail {
    flex-direction: column;
    gap: 0.5rem;
  }

  .tablet_tumbnail {
    display: none;
  }
  .smartPhone_thmbnail, .tablet-smartPhone_tumbnail {
    display: inline-block;
    width: 300px;
    padding: 2rem;
  }

}