h1{
    color: white;
}
body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #333;
}
.calculator {
    width: 360px;
    padding-top: 40px;
    padding-bottom: 40px;
    padding: 20px;
    border-radius: 20px;
    background-color: #000;
    box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.5);
}
.display {
    width: 100%;
    height: 80px;
    background-color: #333;
    color: white;
    text-align: right;
    padding: 10px;
    padding-right: 20px;;
    border-radius: 10px;
    font-size: 2.5em;
    box-sizing: border-box;
    margin-bottom: 20px;
    overflow-x: hidden;
    overflow-y: hidden;
}
.button-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    padding-top: 10px;
    padding-bottom: 10px;
}
button {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: none;
    font-size: 1.5em;
    color: white;
    background-color: #505050;
    cursor: pointer;
    transition: background-color 0.2s;
}
button:active {
    background-color: #787878;
}
.button-row button.large {
    width: 150px;
    border-radius: 30px;
}
.operation {
    background-color: #ff9500;
    color: white;
}
.operation:active {
    background-color: #d77800;
}
.equal {
    background-color: #ff9500;
}
.clear {
    background-color: #a5a5a5;
    color: black;
}
.clear:active {
    background-color: #8c8c8c;
}
.dark-button {
    background-color: #505050;
    color: white;
}
.dark-button:active {
    background-color: #787878;
}