body {
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
}

hr {
    /*width: 200px;*/
}

#title {
    font-size: 24px;
    font-weight: bold;
    letter-spacing: 2px;
    margin-bottom: 0;
}

#subtitle {
    font-size: 8px;
    letter-spacing: 1px;
}

#calculator {
    width: 350px;
    height: 420px;
    margin: 0 auto;
    margin-top: 3px;
    display: flex;
    flex-wrap: wrap;
}

#equation {
    /* Box */
    width: 316px;
    height: 12px;
    margin: 2.5px;
    padding: 5px;

    /* Text */
    color: black;
    font-size: 10px;
    display: flex;
    justify-content: right;
    align-items: center;
}

#displayType {
    /* Box */
    border: none;
    width: 16px;
    height: 52px;
    margin: 2.5px;

    /* Text */
    color: black;
    font-size: 12px;
    writing-mode:vertical-lr;
    display: flex;
    justify-content: center;
    align-items: center;
}

#display {
    /* Box */
    border: 2px solid lightgray;
    width: 282px;
    height: 42px;
    margin: 2.5px;
    padding: 5px;

    /* Text */
    color: black;
    font-size: 32px;
    font-weight: bold;
    display: flex;
    justify-content: right;
    align-items: center;
}

.button {
    /* Box */
    border: 2px solid lightgray;
    width: 72px;
    height: 72px;
    margin: 2.5px;

    /* Text */
    color: black;
    font-size: 32px;
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: center;
}

.units {
    background-color: khaki;
}

.digit {
    background-color: pink;
}

.operator {
    background-color: lightcoral;
}

.punctuation {
    background-color: pink;
}

.clear {
    background-color: lightcoral;
}

.equals {
    background-color: lightcoral;
}