custom.css

@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100..900;1,100..900&display=swap');

/* Reasonable defaults */
html {
    overflow-x: hidden;
    overflow-y: scroll;
    text-rendering: optimizeLegibility;
    text-size-adjust: 100%;
    -moz-osx-font-smoothing: grayscale;
    -webkit-font-smoothing: antialiased;
}

/* Fix responsiveness */
body {
    overflow-x: hidden;
}
div.body {
    min-width: unset;
}

@media screen and (max-width: 940px) {
    ul {
        margin-left: 30px;
    }
}

/* When search bar is in nav footer, don't let it stretch too far */
.searchformwrapper {
    max-width: 250px;
}

/* Fix next/prev links in footer */
/* Don't just float the whole thing right */
nav#rellinks {
    float: unset;
}
nav#rellinks ul {
    padding-left: 0;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}
nav#rellinks li {
    line-height: 1.3;
    padding: 5px 0px;
}
nav#rellinks li:first-child {
    display: block;
    text-indent: -17px;
    padding-left: 17px;
}
nav#rellinks li + li {
    margin-left: auto;
    text-align: right;
    display: flex;
}
nav#rellinks li + li a {
    display: inline-block;
    margin-right: 5px;
}
nav#rellinks li + li:before {
    content: "";
}

/* Emulate a placeholder rather than a heading for search */
.sphinxsidebar #searchbox form.search input[type="text"] {
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' version='1.1' height='50px' width='120px'><text x='10' y='17' fill='gray' font-size='15'>Search...</text></svg>");
    background-repeat: no-repeat;
}
.sphinxsidebar #searchbox form.search input[type="text"]:focus {
    background-image: none;
}

/* Hide unwanted elements*/
.sphinxsidebarwrapper #searchbox h3, /* Search heading */
.sphinxsidebarwrapper > h3, /* Navigation heading */
.sphinxsidebarwrapper p:empty, /* Empty elements taking up space */
.sphinxsidebar .logo-name + a[href], /* Inexplicable but ugly link */
.sphinxsidebarwrapper hr /* Horizontal rules */
{
    display: none;
}

/* Style TOC in sidebar more clearly */
.sphinxsidebarwrapper li.toctree-l1 {
    padding: 0.15em 0;
    line-height: 1.4;
}

.sphinxsidebarwrapper a.current,
.sphinxsidebarwrapper a.current:hover {
    text-decoration: none;
    border-bottom: none;
    cursor: text;
}
/* Tweak spacing */
div.sphinxsidebarwrapper #searchbox {
    margin-bottom: 0;
}
div.sphinxsidebarwrapper .nav-toctree > ul {
    margin: 5px 0;
}
/* Enlarge space between toctrees and external links */
div.sphinxsidebarwrapper .nav-toctree {
    margin-top: 15px;
    margin-bottom: 15px;
}
div.sphinxsidebarwrapper .extra-nav-links {
    margin-bottom: 0;
}

/* Custom body styling */
/* Center captions of figures, examples, etc. */
.body .caption {
    text-align: center;
}

.body .toctree-l1 {
    font-weight: bold;
}

.body .toctree-l2 {
    font-weight: normal;
}

.body .toctree-l3 {
    font-size: 0.8em;
}

.sphinxsidebar .logo-name {
    font-weight: 500;
    font-size: 20px;
}

@media screen and not (max-width: 940px) {
    /* Put the title and logo side by side */
    .sphinxsidebarwrapper {
        display: flex;
        flex-wrap: wrap;
        align-items: flex-start;
        flex-direction: row;
        justify-content: space-between;
        align-content: flex-start;
    }

    .sphinxsidebar .logo-name {
        flex-basis: 120px;
    }

    .sphinxsidebar p.logo {
        flex-basis: 60px;
        text-align: right;
        display: block;
        margin-top: 0 !important;
        margin-right: 20px !important;
    }

    /* Make sure the remaining items use the width of
    * the whole navbar and don't get squished together
    * by flex.
    */
    .sphinxsidebar .logo-name ~ * {
        flex-basis: 100%;
    }

    /* Fix navbar to top */
    .sphinxsidebar {
        position: fixed;
        height: 100vh;
        overflow-y: hidden;
        top: 0;
        float: unset !important;
        margin-left: 0 !important;
    }

    .sphinxsidebarwrapper {
        height: calc(100% - 60px);
        overflow-y: auto;
        padding-top: 30px !important;
        padding-bottom: 30px !important;
        /* Hide scrollbar */
        -ms-overflow-style: none;  /* IE and Edge */
        scrollbar-width: none;  /* Firefox */
    }
    /* Hide scrollbar */
    .sphinxsidebarwrapper::-webkit-scrollbar {
        display: none;
    }
}

/* Space out Breathe a bit more */
.body dl.cpp {
    margin-bottom: 20px;
}

.cpp .sig-name {
    font-size: 1em;
}