h1.h1_1{
  background-color: pink;
  text-align: center;
  color: white;
  border-radius: 10px;
  font-size: 50px;
  font-family: serif;
}
#description{
  width: 800px;
  margin-left: 10px;
  border: 1px solid yellow;
  border-left: 30px solid yellow;
  padding-left: 10px;
  padding-top: 10px;
  padding-bottom: 10px;
  text-indent: 10px;
  text-align: justify;
}
ol{
  list-style-type: none;
}
li.li_1{
/*float:left*/
  display:inline-block;
  text-align: center;
  width: 300px;
  background-color: gray;
  margin-left: 10px;
  padding: 20px;

}
li.li_1:hover{
  background-color: black;
}