#bloc_2.bloc_collection .c_1 .container_collection { background-color: #4b797a; }
 #bloc_2.bloc_collection .c_2 .container_collection { background-color: #4a96a9; }
 #bloc_2.bloc_collection .c_3 .container_collection { background-color: #59bab1; }
 #bloc_2.bloc_collection .c_4 .container_collection { background-color: #cb5447; }