[id^="caso"] {
  display: none;
}

body {
  background-color:silver;
  color:blue;
  font-family: Arial;
  font-size:15px;
}


p {
  background-color:white;
  color:blue;
  font-family: Arial;
  font-size:18px;

}

p2 {
  background-color:white;
  color:red;
  font-family:arial;
  font-style:oblique;
  font-size:20px;
}

span {
  background-color:white;
  color:red;
  font-family:arial;
  font-style:oblique;
  font-size:20px;
}

input {
  background-color:white;
  color:red;
  font-family:arial;
  font-style:oblique;
  font-size:20px;
}

option {
  background-color:blue;
  color: white;
  font-family:arial;
  font-style:oblique;
  font-size:20px;
}