body {
    background-color: black;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.calculator {
    display: flex;
    flex-direction: column;
    background-color: black;
    padding: 10px;
    border-radius: 5px;
}

#display,
#display::placeholder {
    background-color: #333;
    color: white;
    border: none;
    border-radius: 5px;
    text-align: end;
    margin-bottom: 10px;
    padding: 5px 10px;
    font-size: 24px;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 5px;
}

button {
    background-color: #555;
    color: white;
    font-size: 24px;
    padding: 10px;
    border-radius: 5px;
    cursor: pointer;
    border: none;
}

button:hover {
    background-color: #777;
}

.operator {
    background-color: orange;
}

.multiply {
    padding: 6px 0 0 0;
}

.zero {
    grid-column: 1 / span 2; /* von Spalte 1 bis 2 Strecken*/
}

.clear {
    background-color:   indianred;
    grid-column: 1 / span 2; /* von Spalte 1 um die 2 Spalte Strecken*/
}

.equals {
    background-color: cadetblue;
    grid-column: 3 / span 2; /* von Spalte 3 um die 2 Spalte Strecken*/
}