body {
    margin: 0;
    width: 100%;
    height: 100%;
    font-family: "Helvetica Neue",
        Arial,
        "Hiragino Kaku Gothic ProN",
        "Hiragino Sans",
        Meiryo,
        sans-serif;
    background-color: black;

}

#controls {
    padding: 0.5rem;
    position: absolute;
    top: 0;
    right: 0;
    color: whitesmoke;
    display: inline-flex;
    flex-direction: column;
    background-color: black;
    border: 0.01rem solid;
    border-color: whitesmoke;
    width: 10rem;
}

details {
    padding: 0.1rem;
}

.sideBySide {
    display: flex;
}

.btn {
    background-color: grey;
    color: white;
    padding: 0.3rem;
    cursor: pointer;
    width: 100%;
    text-align: center;
}

.btn:hover {
    background-color: #1e3066 !important;
}


input[type="color" i] {
    border: none;
    background: none;
}

.about {
    padding: 2rem;
    height: 100vh;
    background-color: black;
    color: whitesmoke;
    text-align: center;
    font-size: 1.5rem;
}

.privacy_policy {
    padding: 2rem;
    height: 100%;
    background-color: black;
    color: whitesmoke;
    font-size: 1.5rem;
}

.title-404 {
    position: absolute;
    /* 中央に寄せる */
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
}

a {
    color: whitesmoke;
}

p {
    margin-bottom: 1rem;
}

h1 {
    color: whitesmoke;
}

video {
    width: 100%;
    max-width: 600px;
    height: auto;
    display: block;
    margin: auto;
}

/* スマホで見たとき */
@media only screen and (max-width: 750px) {
    .btn {
        margin: 0.2rem;
    }

    input[type="color" i] {
        /* margin: 0.2rem; */
        height: 2rem;
        width: 4rem;
    }

    select {
        margin: 0.2rem;
    }

    option {
        padding: 0.2rem;
    }

    label {
        margin: 0.2rem;
        padding: 0.2rem;
    }
}