.center {
text-align:center;
width: 100%;
margin: 0;
}
  
  
h1{
font-size:30px;
color:#708090;
background-color:white;
margin-bottom:50px;
font-family:Hiragino Kaku Gothic ProN;
text-align:center;
font-weight:normal;
}

h2{
font-size:15px;
color:#708090;
background-color:white;
margin-bottom:50px;
text-align:center;
font-family:Yu Mincho;
font-weight:normal;
}

h3{
font-size:15px;
color:#708090;
background-color:;
margin-bottom:100px;
text-align:center;
font-family:Yu Mincho;
font-weight:normal;
}

h4{
font-size:15px;
color:#708090;
background-color:;
margin-bottom:100px;
font-family:Yu Mincho;
font-weight:normal;
}

.img-flex-4 {
  display:inline-block;
margin:20px;
}
.img-flex-4 a:hover {
opacity: 0.5;
}

h5{
display:inline-block;
margin:20px;
}