body{
    background-image:url("https://media.istockphoto.com/vectors/seamless-endless-pattern-background-with-handwritten-mathematical-vector-id876213296?s=2048x2048");
}
#cuerpo{
    background:aliceblue; 
  border: 5px solid black;
    padding: 35px;
    max-width: 400px;
    max-height: 700px;
    margin:0px auto;
}

#resultado{
    font-family: fantasy;
}
button:hover{
    background-color: crimson;
    color:aliceblue;
    transition-duration: 0.4s;
    border-radius: 15px;
    
}