h2 {
  font-size: 1.3em;
  padding: 20px 0px;
  font-weight: bold;
}

h3 {
  font-size: 1.1em;
  font-weight: bold;
}

.content-block {
  max-width: 800px;
  width: calc(100% - 48px); /* 左右24pxずつ余白 */
  margin: 0 auto;
  padding: 50px 24px 100px 24px;
  text-align: left;
  box-sizing: border-box;

#  background-color: #fff;
  border-radius: 8px;
}

@media screen and (max-width: 768px) {

  h2 {
  font-size: 1.12em;
  font-weight: bold;
}

  h3 {
  font-size: 1.0em;
  font-weight: bold;
}
  
  .content-block {
#    width: calc(100% - 32px); /* 左右16pxずつ余白 */
    padding: 50px 0px;
  }
  
}