This theme is based on TracFlat from ​TracTweakTheme

:root {
    --universal-margin: 0.5rem;
    --universal-padding: 1.25rem;
    --universal-border-radius: 0.2rem;
    --a-link-color: blue;
    --a-visited-color: #551A8B;
}

body {
    background: #f0f0f0;
    padding: var(--universal-padding);
    font-size: 0.95em;
}

#header {
    height: 5em;
    text-align: center;
}

#search {
    text-align: center;
}

#wikipage, #content {
    background: #fff;
    padding: calc(var(--universal-padding) * 2);
    background: rgb(254, 254, 254);
    box-shadow: rgba(0, 0, 0, 0.1) 0px 1px 0px;
    border-radius: var(--universal-border-radius);
    border: 1px solid rgb(207, 207, 207);
}

#content.wiki {
   background: none;
   border: none;
   box-shadow: none;
   padding: 0;
}

.wikipage h1, .wikipage h2, .wikipage h3, .wikipage h4, .wikipage h5, .wikipage h6 {
margin-left: 0;
margin-right: 0;
padding-left: 0;
}

#mainnav {
    border: 0;
    margin-left: auto;
    margin-right: auto;
    margin-top: 0.66em;
    margin-bottom: 0.33em;
    letter-spacing: 0;
}

#mainnav > ul, #metanav > ul {
    text-align: center;
}