body {
  font-family: Verdana, "Hiragino Kaku Gothic Pro", "ヒラギノ角ゴ Pro W6",
    Arial, sans-serif;
  padding: 0;
  margin: 0;
  overflow-x: hidden;
  line-height: 1.8em;
  text-align: center;
}
h1 {
  text-align: center;
  font-weight: bold;
  padding: 10px 0 20px 0;
  line-height: 1.4em;
}
h2 {
  font-size: 20px;
}
header{
  position: fixed;
  width: 100%;
  padding: 1.5rem;
  top: 0;
  background: #333;
  transition: .8s ease;
}
header .logo{
  font-size: 2rem;
  color: #fff;
}
.container{
  max-width: 800px;
  height: 500vh;
  margin: 0 auto;
  margin-top: 90px;
}
.container .content{
  height: 90%;
  height: 350px;
  margin-bottom: 70px;
  border: 1px dotted #333;
  border-radius: 8px;
}
.isScroll{
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 100px;
  font-weight: bold;
}
.red{
  color: red;
}
.blue{
  color: blue;
}