body{
    background-image:url("https://image.freepik.com/vector-gratis/fondo-dibujos-animados-concepto-matematicas_23-2148147844.jpg");
}

#contenedor{
    text-align: center;
    margin:auto;
    border-radius: 40px;
    width:30%;
    border-style:groove;
    background-image: url("calculadora.jpeg");
    font-weight: bolder;
    justify-content:center;
    }
h1{
    font-size: 20px;
    color:black;
    background-color: darkgray;
    border-radius: 40px;
}
#titulo{
    text-align: center;
    border-radius: 30px;
    border-style:groove;
    color: cornflowerblue;
    background-color: bisque;
}
button{
    font-size: 15px;
    color:darkolivegreen;
    background-color:darkseagreen;
    border:2px black solid;
    border-radius: 20px;    
}
button:hover{
    font-size: 15px;
    color:black;
    background-color: skyblue;
    border:2px blue dotted;
    border-radius: 20px;   
}
a{
    text-align: center;
    border-radius: 80px;
    border-style:groove;
    font-weight: bolder;
    background-color: darkgray;
    color: blue;
    
    
}