body {
    font-family: Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    margin-bottom: 50px
}
.degrade {
    background: -webkit-gradient(linear, left top, left bottom, from(#52555D), to(#FFF));
    background-repeat: no-repeat;
    background-size: cover;
}
img {
    margin-top: 0;
    display: block;
    margin-right: auto;
    margin-left: auto;
    max-width: 100%;
}
html {
    margin: 0 0 0 0;
}
h1 {
    text-align: center;
    font-size: 2em;
    margin-top: 30px;
    margin-bottom: 30px;
}
h2 {
    text-align: center;
    font-size: 1.5em;
}
h3 {
    text-align: center;
    font-size: 1.3em;
    margin-bottom: 10px;
}
.block {
    width: 60%;
    padding: 0;
    margin: 0 auto;
    border: 1px solid #ddd;
}
li {
    font-size: 1em;
    list-style-type:disc;
    text-align: left;
    font-weight:bold;
    
}
p {
    text-align: center;
}
a {
    font-size: 1.5em;
}
ul {
    margin-top: 10px;
   
    
    
    
}
.boite{
    width: 60%;
    display: block;
    margin-left: auto;
    margin-right: auto;
    
}
a:link {
    text-decoration: none;
    color: #5B7A8E ;
}
a:hover {
    color: red;
}