*{
    box-sizing: border-box;
}

body{
    margin: 0;
    padding: 0;
}
img{
    width: 100%;

}
.row{
    display: flex;
    padding: 5px;
}
.column{
    flex: 25%;
    padding: 5px;
}

.ir_atras{
  display: inline-block;
  padding: 10px;
  background: transparent;
  font-size: 10px;
 
  cursor: pointer;
  position: fixed;
  bottom: 20px;
  right: 20px;
 border-radius: 3px;
}