.dochead {
    display: flex;
    align-items: center;
    background: #00f;
    color: #fff;
    padding: 1rem;
    font-weight: bold;
}
.dochead .docnav {
    display: flex;
    align-items: center;
    width: fit-content;
    margin: 0 0 0 auto;
}
.dochead .docnav a {
    display: block;
    margin: 0 1rem 0 0;
}

@media screen and (max-width: 599px) {
    .dochead {
        display: flex;
        align-items: center;
        white-space: nowrap;
        overflow-x: auto;
        background: #00f;
        color: #fff;
        padding: 1rem;
        font-weight: bold;
    }
    .dochead .docnav {
        display: flex;
        align-items: center;
        width: fit-content;
        margin: 0 0 0 2rem;
    }
    .dochead .docnav a {
        display: block;
        margin: 0 1rem 0 0;
    } 
}

.tabs {
    display: flex;
    border-bottom: 3px solid #00f;
    margin: 5rem 0;
}
.tabs a {
    display: block;
    width: fit-content;
    border-radius: .25rem .25rem 0 0;
    padding: calc(1rem + 3px) 1rem 1rem 1rem;
}
.tabs a.this {
    background: #00f;
    color: #fff;
}

.main {
    width: 1000px;
    margin: 5rem auto;
}
.main h1 {
    font-size: 1.95rem;
    font-weight: bold;
    margin: 0 0 1.95rem 0;
}
.main h2 {
    font-size: 1.5rem;
    font-weight: bold;
    margin: 2.5rem 0 1.5rem 0;
}
.main p {
    line-height: 1.5rem;
    margin: 1.5rem 0;
}
.main ul {
    line-height: 1.5rem;
    margin: 1.5rem 0 1.5rem 1rem;
    list-style-type: disc; 
}

@media screen and (max-width: 599px) {
    .main {
        width: 100%;
        margin: 0;
        padding: 3rem 1rem;
    }
    .main h1 {
        font-size: 1.95rem;
        font-weight: bold;
        margin: 0 0 1.95rem 0;
    }
    .main h2 {
        font-size: 1.5rem;
        font-weight: bold;
        margin: 2.5rem 0 1.5rem 0;
    }
    .main p {
        line-height: 1.5rem;
        margin: 1.5rem 0;
    }
    .main ul {
        line-height: 1.5rem;
        margin: 1.5rem 0 1.5rem 1rem;
        list-style-type: disc; 
    }
}

iframe {
    display: block;
    width: 100%;
}