body {
    width: 100vw;
    font-family: "Noto Sans JP", sans-serif;
    background: hsla(138, 82%, 69%, 1);
    background: linear-gradient(
        90deg,
        hsla(138, 82%, 69%, 1) 0%,
        hsla(186, 100%, 50%, 1) 100%
    );
}

#app {
    display: flex;
    justify-content: center;
    align-items: center;
}

.calculator__container {
    margin-top: 3rem;
    text-align: center;
}

h1 {
    margin-bottom: 2rem;
    font-size: 2rem;
    font-weight: 700;
}

table {
    max-width: 350px;
    margin-right: auto;
    margin-left: auto;
    border: 5px solid #0009;
    border-collapse: collapse;
}

table *::selection {
    color: inherit;
}

th {
    width: 100%;
    text-align: right;
    line-height: 1.2;
    padding: 1.2rem 1.5rem;
    font-size: 2em;
}

th small {
    width: 100%;
    word-break: break-all;
    font-weight: 200;
    font-size: 0.9rem;
    letter-spacing: 0.1em;
}

td {
    padding: 1.3rem 1rem !important;
    text-align: center;
    cursor: pointer;
    font-size: 1.2em;
}

td#clear {
    background: rgb(197, 114, 114);
}

td#equals {
    background: rgb(114, 160, 197);
}

td#backward,
td[data-type="operator"] {
    background: rgb(45, 45, 45);
}

td:hover,
td:focus {
    background: rgba(60, 60, 60);
}