h1{
text-align: center;
font-size: 40px;

}

h2{
font-size: 40px;
border-style: solid;
color: #fffacd;
  background: #20b2aa;

}



<!--div.under{
background: linear-gradient(transparent 50%, #ffff66 40%) ;
font-size: 20px;
}-->

div.under{
background-color: #ffff66;
}
div.tyokai {position: relative;
	  top: 40em;}
div.hiyori {position: absolute;
	  left: 50em; top: 15em;
	  }
div.clear{clear: both;}

.box{
background-color: #ffffff;
margin: 2em 0;
padding: 2em;
}
.box5 {
    padding: 0.5em 1em;
    margin: 5em 0 5em;
    border: double 5px #4ec4d3;
}
.box5 p {
    margin: 0; 
    padding: 0;
}