* {

    box-sizing: border-box;
}

body {
    font-family: Roboto, Arial, "Noto Sans JP", sans-serif;
    min-height: 100vh;
    background: #202020;
    color: white;
    font-size: 16px;
}

a,
a:visited {
    text-decoration: none;
    color: white;
    display: flex;
    align-items: center;
    border-radius: 5px;
}

p {
    margin: 0;
}

button {
    border: none;
    border-radius: 20px;
    background-color: white;
    color: black;
    font-size: 16px;
}

header button {
    background: none;
    color: white;
}

main {
    top: 70;
}

header {
    margin-bottom: 30px;
}

.header_content1 {
    margin-bottom: 10px;
    display: flex;
}

.header_content2 {
    display: flex;
    gap: 10px;
}

.header_content2 * {
    background: rgba(255, 255, 255, .15);
    padding: 5px;
}