.fondo-presentacion{margin:0;height:auto;background-position:50%;background-repeat:no-repeat;background-size:cover}.diapositiva{position:relative}.bag{position:absolute;width:50px;height:40px;background:red}.imagen{position:relative}.a{background-color:brown}.b{background-color:#0fddaa}.c{background-color:#8a2be2}.d{background-color:#03567c}.fondo{margin:0;height:auto;background-color:#ccc;background-position:50%;background-repeat:no-repeat;background-size:cover}.diapositiva{width:200px;transition:width 4s;cursor:pointer}