body, html {
    margin: 0;
    padding: 0;
    width: 100dvw;
    height: 100dvh;
    background-color: black;
    overflow: hidden;
}

.calculator {
    background-color: black;
    padding: 2rem;
}

.display-container {
    margin-bottom: 1rem;
}

.display {
    width: 94.5dvw;
    height: 8dvh;
    padding: 1rem;
    font-size: 3.5rem;
    text-align: right;
    border: none;
    border-radius: 5px;
    margin-bottom: 0.5rem;
    background-color: black;
    color: white;
}

.past-display {
    font-size: 2rem;
    color: #888;
    background-color: black;
}


.button-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    height: 68dvh;
}


button {
    width: 100%;
    height: 100%;
    font-size: 2rem;
    border: none;
    border-radius: 40px;
    background-color: #2C2A2A;
    color: white
}

.btn-operator {
  background-color: #faa231;
  color: white;
}

.btn-equal {
    background-color: #faa231;
    color: white;
}

button[value="CLR"],
button[value="DEL"],
button[value="←"],
button[value="→"]{
    background-color: #5E5C5A;
}

button[type="button"]:hover {
    background-color: white;
    color: black
}