h1{
    text-align: center;
    margin:0 ;
    font-size: 30px;
    font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen,
    Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;
    color: #2500BF
}
h2{
    text-align: center;
    margin:0 ;
    font-size: 30px;
    font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen,
    Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;
    color: #2500BF
}
p{
    text-align: justify;
    list-style-position: inside;
    font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen,
    Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif; 
    color: #190080;
    width: 800px;
    margin: 0 30%;
}
ul{
    text-align: justify;
    list-style-position: inside;
    color: #190080;
    width: 800px;
    margin: 0 30%;
}

li{
    text-align: justify;
    margin:0;
    font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen,
        Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif; 
    color: #190080;
    width: 800px;
    margin: 0 5%;
}

header
{
    display:;
    color: #FF75AA;
    background-size:     cover;                      /* <------ */
    background-repeat:   no-repeat;
    background-position: center center; 
    z-index: -1; /* pour que ce sois en "arriere plan" */
}
  
#logo
{
position: relative;
right:0;
top:0;
height:50px;
}

body {
  background-image: url("images/bg_light.svg");
  background-size:     cover;                      /* <------ */
  background-repeat:   no-repeat;
  background-position: center center; 
}

footer{
font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen,
    Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;
margin:0;
position:absolute;
bottom:0;
right:0;
}