* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    height: 100vh;
    width: 100vw;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: Arial, Helvetica, sans-serif;
    background-color: crimson;
    line-height: 1.75;
}

.app {
    width: 474.5px;
}

.app * {
    color: rgb(229, 229, 229);
}

.app button {
    padding: 8px 16px;
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
    border: none;
    font-size: 16px;
    background-color: rgb(16, 16, 16);
}

.app button.active {
    background-color: rgb(26, 26, 26);
}

.app button:hover {
    background-color: rgb(26, 26, 26);
}

.app input,
select {
    border: 1px solid rgb(80, 80, 80);
    outline: none;
    border-radius: 4px;
    font-size: 16px;
    background: transparent
}

input[type=number]::-webkit-inner-spin-button {
    -webkit-appearance: none;
}

option {
    background-color: rgb(26, 26, 26);
}

.calculator {
    background-color: rgb(26, 26, 26);
    padding: 24px 36px;
    border-radius: 16px;
    border-top-left-radius: 0px;
    max-width: fit-content;
}