* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    margin: 0;
}

body {
    display: flex;
    justify-content: center;
    background-image: url(26984565_1964.jpg);
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}

/* .contenedor {
    display: flex;
    justify-content: center;
    height: 100vh;
    padding: 20px;
} */


.calculadora {
    display: flex;
    flex-direction: column;
    width: 500px;
    font-size: 2em;
    border: 1px solid grey;
    margin-top: 160px;


}

.visor {
    border: 1px solid grey;
    padding: 25px 15px;
    text-align: right;

}

.teclado {
    display: flex;
    width: 100%;
}

.numeros {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
}

.boton {
    width: 25%;
    border: 1px solid grey;
    padding: 10px;
    text-align: center;
    /* height: 80px; */
}

.boton:hover {
    filter: brightness(80%);
    transition: .4s;
    background-color: rgb(242, 242, 242);
    cursor: pointer
}

.boton.toolarge {
    width: 75%;
}

.boton.large {
    width: 50%;
}

.boton.celeste {
    background-color: #c7e3ed;
}