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

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #000514;
}

.container {
    position: relative;
    max-width: 300px;
    width: 100%;
    border-radius: 12px;
    padding: 10px 20px 20px;
    background: #222020;
}

.input {
    height: 80px;
    width: 100%;
    outline: none;
    border: none;
    text-align: right;
    margin-bottom: 10px;
    font-size: 25px;
    color: #000;
    background: #797272;
    border-radius: 10px 10px 0px 0px;
}

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

.button button {
    width: 100%;
    height: 50px;
    border-radius: 5px;
    border: none;
    cursor: pointer;
    font-size: 20px;
    background-color: #797272;
}

.button button:active {
    transform: scale(0.99);
}

.operator {
    color: #001aff;
}

.ac,
.del{
    color: #ff0000;
}