ul li {
  list-style: none;
}
#as {
  margin-top: 20px;
  padding-top: 20px;
  height: 10px;
}

#problem {
  height: 25vh;
  width: 50vh;
  text-align: center;
  justify-content: center;
  margin: auto;
  padding-top: 15px;
  font-family: Cambria, Cochin, Georgia, Times, "Times New Roman", serif;
  font-size: 60px;
  text-decoration: underline;
  background-color: #81c784;
}
#problem a {
  color: white;
}

#for {
  padding: 25px;
}
#submit {
  margin-top: 45px;
  color: black;
  border: 1px solid;
  padding: 5px;
}