body {
    background: #191919;
    color: white;
    margin: 0;
}

header {
    display: flex;

    justify-content: space-between;
    align-items: center;

    height: 50px;
    padding: 0 30px;

    background: #2e2e2e;
    
}

div {
    text-align: center;
    min-height: 1000%;
}

h1 {
    font-size: 25px;
}

h2 {
    font-size: 125px;
    text-shadow: 0px 0px 25px rgb(65, 65, 65);
    margin-top: 285px;
}

h3 {
    font-size: 35px;
    margin-top: 420px;
    text-shadow: 0px 0px 25px black;
}

h4 {
    font-size: 55px;
    margin-top: 350px;
    text-shadow: 0px 0px 25px black;
}

h5 {
    font-size: 15px;
    margin-top: 5px;
    text-shadow: 0px 0px 25px black;
}

h6 {
    font-size: 25px;
    margin-top: 165px;
    text-shadow: 0px 0px 25px black;
}

h7 {
    font-size: 11.5px;
    margin-top: 240px;
    text-shadow: 0px 0px 15px black;
}

p {
    font-size: 45px;
    text-shadow: 0px 0px 20px black;
    margin-top: 480px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 15px;
}


.icons img {
    width: 50px;
    height: 50px;

    border-radius: 50%;
}

.content {
    display: flex;

    flex-direction: column;

    align-items: center;

    padding-top: 100px;
    padding-bottom: 200px;
}


button {
    width: 345px;
    height: 55px;

    background: #2e2e2e;
    color: white;

    border: none;

    font-size: 20px;
    cursor: pointer;
}


button {
    transition: 0.5s;
    margin-top: 20px;
}


button:hover {
    transform: translateY(-3px);
    background: #616161;
    box-shadow: 0 10px 25px rgb(50, 50, 50);
}

a {
    color: #ff0000; /* 通常 */
}

a:hover {
    color: gray; /* マウスを乗せた時 */
}

a:visited {
    color: purple; /* 一度開いた後 */
}

iframe {
    width: 560px;
    height: 315px;

    margin-top: 45px;
}

img {
    width: 70%;
    height: auto;
}