#contenedor {
    border: 1px solid black;
    width: 22em;        /**/
    margin: 2em auto;
    padding:15px;
    text-align: center;
    background-color: lightGrey;
    

}



table{

   
    border-collapse: separate;
    border-spacing: 0 0.5em;
    table-layout: fixed;
     width: 100%;

}

td{
    
    padding:0.2em;
}

button {
    width: 100%;
    height: 3em;
}



#fondoCalculadora{
	border: 3px solid black;
    width: 17em;        /**/
    margin: 2em auto;
    padding:15px;
    text-align: center;
    background-color: #035096;
}

#pantalla {

    position: relative;
     font-size:3em;
    text-align: right;
    background-color: black;
    color: #1AF20A;
    padding-right: 5px;
    padding-top: 0.3em;
    height: 1.5em;
    min-width: 100%;
    max-height: 1.5em;
    //white-space: nowrap;
    overflow: hidden;
    display: inline-block;
    font-weight: bold;
    border-radius: 5px;

}
#memoria {

    position: relative;
    font-size:3em;
    text-align: right;
    background-color: black;
    color: #1AF20A;
    padding-right: 5px;
    padding-top: 0.3em;
    height: 1.5em;
    min-width: 100%;
    max-height: 1.5em;
    white-space: nowrap;
    overflow: hidden;
    display: inline-block;
    font-weight: bold;
    border-radius: 5px;

}