body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background: rgb(245,245,245);
}

#prevPageBtn {
          position: fixed;
          top: -25px;
          left: 0px;
          /*background-color: #007bff;*/
          background: rgba(0,0,0,0);
          color: #222;
          border: none;
          border-radius: 50%;
          width: 50px;
          font-size: 60px;
          cursor: pointer;
          font-weight: bolder;
          vertical-align: middle;
        }

        #prevPageBtn:hover::after {
          content: "Page précédente";
          font-size: 20px;
          position: absolute;
          top: 50%;
          left: 120%;
          transform: translateY(-50%);
          background-color: rgba(0, 0, 0, 0.8);
          color: white;
          padding: 5px;
          border-radius: 5px;
          white-space: nowrap;
          display: none;
        }

        #prevPageBtn:hover::before {
          content: "";
          position: absolute;
          top: 50%;
          left: 100%;
          margin-top: -5px;
          border: 5px solid transparent;
          border-left-color: rgba(0, 0, 0, 0.8);
          display: none;
        }

        #prevPageBtn:hover::after, #prevPageBtn:hover::before {
          display: block;
        }
form {
    width: 230px;
    margin: 0 auto;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background-color: rgba(255,255,255,0.6);
    position:relative;
}
form input, label{
    width: 210px;
    margin-bottom: 10px;
    padding: 5px;
}
.titre{
    text-align:center;
    font-size: 30px;
    font-weight:bold;
}