button
{
    cursor:pointer;
    margin:2px;
    outline:none;
    border-style: outset;
    text-decoration:none;
    border:none;
}

button:focus
{ 
    outline-color: transparent; 
    outline-style: none;
}

.keys_symbols
{
    width:33px; 
    height:33px;
    border-radius:5px;
    font-size:15px;
    cursor:pointer;
    margin:2px;
    background-color:#dbdbdc;
    border-bottom: 2px solid #3DBBFF;
}

.keys_numbers
{
    width:33px; 
    height:33px;
    border-radius:5px;
    color:white;
    font-size:15px;
    cursor:pointer;
    margin:2px;
    background-color:#35A1DB;
    border-bottom: 2px solid #dbdbdc;
}

.keys_letters
{
    width:33px; 
    height:33px;
    border-radius:5px;
    font-size:15px;
    cursor:pointer;
    margin:2px;
    background-color:#dbdbdc;
    border-bottom: 2px solid #3DBBFF;
}

.button_big
{
    background-color:#dbdbdc; border-bottom: 2px solid #3DBBFF; width:90px;
}

#contador
{
    width:80px;
    height:80px;
    font-size:30px;
    border:5px solid gray;
    border-radius:50px;
    text-align:center;
    margin-top:10px;
    padding-top:12px;
    margin:auto;
}