html, body {
margin: 0px;
padding: 0px;
height: 100%;
width: 100%;
background-color: #87CEFA;
}
h3, h2 {
text-align: center;
background-color: #F0FFFF;
}
div {
position: absolute;
top: 50%;
left: 50%;
width: 417px;
margin-left: -170px;
height: 423px;
margin-top: -175px;
padding: 5px;
border: 5px solid #66CDAA;
background-color: #F5FFFA;
}
button {
font-size: 20px;
font-family: Verdana, Helvetica;
font-weight: bold;
color: white;
background: hsl(102, 40%, 80%);
border-bottom: 1px solid blue;
width: 80px;
height: 49px;
}
.pantalla {
font-size: 27px;
font-family: Verdana, Helvetica;
font-weight: bold;
color: blue;
background-color: #5F9EA0;
text-align: right;
border: 2px;
width: 410px;
height: 49px;
}
hr {
background-color: black;
height: 6px;
}