.div_menu {
  float:left;
  width:20%;
  display:inline-block;
  margin:auto;
  position:fixed;
  align-content: center;
  z-index: 0;
}

hr.section {
  border-top: 3px double #8c8b8b;
}

img.me {
  float:right;
  max-width: 15%;
  min-width: 150px;
  margin-left: 10px;
  display: block;

}

@media all and (max-width: 900px){
  .me{
    display: none;
  }
}

@media all and (max-width: 850px){
  .div_menu{
    display: none;
  }
}

.div_lv1 {
  width:60%;
  min-width: 500px;
  max-width: 800px;
  display:block;
  margin:auto;
  z-index: 3;
}

.author {
  font-style: italic;
}

.des{
  font-family:sans-serif;

}

h1{
  margin-top: 40px;
  text-align:justify;
  align-content: center;
}

h2{
  text-align:justify;
  align-content: center;

}

img {
    width: 90%;
    margin:auto;
    margin-top: 20px;
    display:inline-block;
    margin-bottom: 100px;
}



p {
  text-align:justify;
  margin:auto;
}

hr {
  text-align: center;
  display:block;
  margin:auto;
  margin-top: 20px;
}

/* for menu */

ul {
    overflow: hidden;
    background-color: #0;
}

li {
  padding: 12px;
  text-align: justify;
}

li a {
    display: inline-block;
    color: black;
    text-align: left;

    text-decoration: none;
}

li a:hover {
    font-style: oblique;
    color: blue;
}