#yuigonsyo-header-container {
    margin: 16px 4px;
    display: block;
}

.yuigonsyo-header-h1 {
    width: 60%;
    font-size: 1.5em;
    white-space: nowrap;
    text-align: center;
}

@media(min-width: 768px) {
    #yuigonsyo-header-container {
        margin: 16px 0;
        display: flex;
        justify-content: center;
    }

    .yuigonsyo-header-h1 {
        width: 60%;
        white-space: nowrap;
        text-align: center;
    }

}