body {
  width: 100%; /*ページ全体の幅は100%と指定する*/
  text-align: center; /*ページ全体を中央揃えにする*/
}

h1 {
  font-size: 1.5em;
  font-weight: bold;
  margin: 15px 0;
}

a {
  color: skyblue;
}

.main-container {
  width: 100%;
  margin: 30px auto;
}

.btn-square {
  display: inline-block;
  padding: 20px 40px;
  text-decoration: none;
  background-color: #333;
  color: #FFF;
  border-bottom: solid 4px #222;
  border-radius: 10px;
}
.btn-square:active {
  -webkit-transform: translateY(4px);
  transform: translateY(4px);
  border-bottom: none;
}


.btn-blue {
  background-color: hsl(194, 96%, 47%);
  color: #FFF;
  border-bottom: solid 4px #0073b6;
}

.wrap {
  width:60%;
  margin: 2em auto;
  padding: 0;
}

@media screen and (max-width: 600px) {
  .wrap {
    width:80%;
  }
  .content p {
    text-align: left;
  }
}

.wrap label {
  display: block;
  padding : 8px;
  color: #fff;
  font-weight: bold;
  background: #999;
  cursor: pointer;
}

.wrap input[type="checkbox"] {
  display: none;
}

.wrap .content {
  height: 0;
  padding: 0;
  overflow: hidden;
  margin-bottom: 10px;
  border: 1px solid #ccc;
}

.switch:checked + .content {
  height: auto;
  padding: 8px;
  background: #f7f7f7;
}