body {
  color: rgb(52, 73, 94);
}

div {
  color: rgb(52, 73, 94);
}

li {
  color: rgb(52, 73, 94);
}

h1 {
  color: rgb(45, 194, 107);
}

h2 {
  color: rgb(45, 194, 107);
}

h3 {
  color: rgb(45, 194, 107);
}

#Poster {
   float: right;
   margin: 18px 0 0 16px;
   height: 484px;
   width: 342px;
}

#Poster:hover {
   content: url('https://indico.global/event/17419/attachments/69252/134237/poster2_small.jpg');
   float: right;
   margin: 18px 0 0 16px;
   height: 484px;
   width: 342px;
}