.anonymous {
  background-color:#760E2B; 
  color:white;
}

.example {
  color:#007edf;
}

/* Three image containers (use 25% for four, and 50% for two, etc) */
.colonne {
  float: left;
  width: 50%;
  padding: 5px;
}

/* Clear floats after image containers */
.ligne::after {
  content: "";
  clear: both;
  display: table;
} 

* {
  box-sizing: border-box;
}