body {
    font-family: 'Source code pro',Calibri,sans-serif;
    background-color: aquamarine;
    margin: 0px;
    padding: 0px
}
h1{
    border-width: 4px;
    border-color: #00ff00;
    border-style: inset;
    color:#ff0000;
}
div{
    clear: both;
}
h2 {
    text-align: center;
    margin: 0px;
    padding: 0px;
}
h3 {
    text-align: center;
    background-color: #00ff00;
}
h4{
    text-align: center;
}
p {
    border: #fff099;
    border-width: 17 px;
    border-style: double;
    text-decoration: underline;
    text-decoration-color: chartreuse;
}
nav ul li{
   list-style-type: none;
   display: inline-block; 
   padding: 10px;
}
ul li a{
    color: #ffffff;
    letter-spacing: 0.1rem;
}
ul li a:hover{
    color: #ff0000;
    text-decoration: none;
}
.menu li{
    float: left;
    padding: 35px;
}
.menu li a{
    text-decoration: none;
}
form{
    padding: 35px;
    text-align: right;
}

.histoire{
    text-decoration: none;
    border: none;
    text-align: center;
}
@media (max-width: 600px) {
  .container {
    flex-direction: column;
  .menu{
    float: left;
  }
  }
}