.zen-kaku-gothic-new-regular {
    font-family: "Zen Kaku Gothic New", sans-serif;
    font-weight: 400;
    font-style: normal;
  }
body{
    background: rgb(60, 61, 85);
    color: rgb(219, 219, 219);
    font-family: helvetica neue, helvetica, arial, "Zen Kaku Gothic New", sans-serif;
    margin-top: 0;
}
a{
    color: rgb(189, 107, 189);
}
a:hover{
    color: black;
}
header{
    background: rgb(45, 46, 65);
    height: 100px;
    margin-bottom: 20px;
    border-radius: 10px;
    
}
nav{
    text-align: center;
    line-height: 100px;
}
.go_back{
    text-align: center;
    font-size: 50px;
}
.About4 {
    line-height: 40px;
    text-align: left;
}
.About3 {
    text-align: center;
    margin-top: 40px;
}
.About2 {
    text-align: center;
}
.About {
    padding: 0 px;
    display: inline-block;
    text-align: center;
}
.learning_diagram{
    width: 700px;
    display: block;
    margin: auto;
}
div4{
    background: rgb(45, 46, 65);
    padding: 0px 60px;
    width: 720px;
    min-height: 100px;
    position: relative;
    border-radius: 10px;
}