style.css

#menu{margin: 0;}
.menu_{display:inline-block;margin: 0 15px;vertical-align:top}
.menulogo{display:inline-block;margin: 0 15px;vertical-align:top}

html{
  background-color: #101010;
  font-family : 'Roboto', Arial, sans-serif;
}

.menu {
  background-color: black;
  padding: 5px;
}

.menulogo {
  list-style-type: none;
  margin: 5px 0;
}

.menulogo button {
  background-color: transparent;
  color: white;
  border: 1px;
  padding: 10px 10px;
  cursor: pointer;
  outline: none;
}

.menulogo button:hover {
  background-color: rgba(255, 255, 255, 0.2);
}

.menu_ {
  list-style-type: none;
  margin: 10px 0;
}

.menu_ button {
  background-color: transparent; 
  color: white; 
  border: 1px;
  padding: 10px 20px;
  cursor: pointer;
  outline: none;
}

.menu_ button:hover {
  background-color: rgba(255, 255, 255, 0.2);
}

.class1red {
  list-style-type: none;
  margin: 10px 0;
}

.class1red button {
  background-color: red; 
  color: white;
  border: 1px; 
  padding: 10px 20px; 
  cursor: pointer; 
  outline: none; 
}

.class1red button:hover {
  background-color: rgba(255, 27, 27, 0.9); 
}

.haut_page{
  background-image:url("imgdexemple.jpg");
  background-color: #202020;
  color: white;
  padding: 20px;
}

.page_tech{
    background-color: #202020;
    overflow: hidden;
    color: white;
    padding: 20px;
}

.img{
    float:left;
    border-radius:10px 10px;
}

.imgright {
    float: right;
    border-radius:10px 10px;
}


.font_txt{
    line-height: 2;
}

 footer{
  background-color: transparent;
  margin: 5px 0;
  color: white;
  text-align: center;
  padding: 5px;
}