.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;
}
header{
    margin: 50px;
}
a{
    color: green;
}
a:hover{
    color: aqua;
}
.Nav_list1 {
    text-align: center;
}
.Nav_list2 {
    padding: 0 100px;
    display: inline-block;
    text-align: left;  
}
.title_nav{
    text-align: center;
    font-size: 50px;
}
div4{
    background: rgb(45, 46, 65);
    width: 680px;
    min-height: 100px;
    position: relative;
    border-radius: 10px;
    
}
.ul_index{
    list-style-type: initial;
    font-size: 40px;
    margin: px;
}
.ul_index .li_index{
    margin: 25px 0px;
}