*{
    margin:0;
    padding: 0;
}
body{
    background: #6E6E6E;
}
#contenedor{
    margin:0 auto;
    text-align: center;
    margin: 40% 0;
}

table{
    margin:10px auto
}

.viewer{
    width: 220px;
    margin:5px;
    font-size: 25px;
}

.btn{
    width: 50px;
    height: 50px;
    font-size: 25px;
    margin:2px;
    background: transparent;
    border: 1px solid #FA6D65;
    color: white
}

#suma{
    height: 110px;
}
#igual{
    width: 110px;
}

@media (min-width:768px){
    #contenedor{
        margin: 8% 0;
    
    }
}

@media (min-width:980px){
    #contenedor{
        margin: 22% 0;
    
    }
}