body{
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header{
  height: 150px;
  text-align: center;
  border: 1px solid;
  font-size: 30px;
  line-height: 150px;
  background-color: #cce5ff;

}

div{
  display: flex;
  flex: 1;
  background-color: #d6ffff;
}

main{
  flex: 1;
  border: 1px solid;
}

nav{
  width: 200px;
  border: 1px solid;
}

footer{
  height: 100px;
  border: 1px solid;
  background-color: #d6ffff;
}

h1{
    text-align: center;
}

li.now{
  text-decoration: underline;
}