@import url('https://fonts.googleapis.com/css2?family=Stylish&display=swap');

html, body {
 /*   width: 600px;
    border: 3px solid brown; */
    margin: 0;
    padding: 0;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: url(../img/fondo01a.jpg);
    background-repeat: no-repeat;
    background-position: center center;
    background-size: cover;
    background-attachment: fixed;
}

calculator {
    background-color: #f1f1f1;
    border-radius: 10px;
    padding: 20px;
    box-sizing: 0 4px 8px rgba(0,0,0,0.2);
    width: 320px;
}
#title {
    font-size: 40px;

    text-align: center;
    margin-bottom: 20px;
    color: #fff;
    font-family: 'Times New Roman', Times, serif;
}

button {
    padding: 20px;
    font-size: 24px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: background-color 02s ease;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4,1fr);
    grid-gap: 10px;
    font-style: bold;
}

#display {
    width: 94%;
    padding: 10px;
    font-size: 32px;
    text-align: right;
    border: 1px solid #CCC;
    margin-bottom: 10px;
    background-color: #f8f8f8;
    color: #333;
}

.remove-button {
    background: url(../img/deletes.jpg);
    background-size: 95% 95%;
    background-repeat: no-repeat;
    background-position: center;
    padding: 20px;

}

/*
.b9 {
    background: url(../img/9pot.png);
    background-size: 95% 95%;
    background-repeat: no-repeat;
    background-position: center;
    padding: 20px;
    border-radius: 10px;
}
*/

button:hover {
    background-color: #a4df1a;
}
button:active {
    background-color: #ff0505;
}

/* expandir dos columnas */
.equal-button {
    grid-column: span 2;
    background-color: #f44336;
    color: #fff;
}

/*
Color para botones especificos
*/
button[value="%"], button[value="."] {
    background-color: #009966;
    color: #fff;
}

button[value="R"] {
    background-color: #009688;
    color: #fff;
}

button[value="C"] {
    background-color: #9c27b0;
    color: #fff;
}

button[value="/"], button[value="*"], button[value="-"], button[value="+"] {
    background-color: olive;
    color: #fff;
}

button[value="0"], button[value="1"], button[value="2"], button[value="3"],
button[value="4"], button[value="5"], button[value="6"], button[value="7"],
button[value="8"], button[value="9"]
{
    background-color: gray;
    color: #fff;
}

.expre {
    background: #a4df1a;
    color: #fff;
}