create/src/Mod/Start/StartPage/StartPage.css

/* --- MAIN --- */

html {
    height: 100%;
    color: BGTCOLOR;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

body {
    height: 100%;
    background: BACKGROUND;
    color: BGTCOLOR;
    font-family: FONTFAMILY;
    font-size: FONTSIZE;
    overflow: hidden;
}

OVERFLOW
a,
a:link,
a:visited {
    text-decoration: none;
    color: LINKCOLOR;
    font-weight: bold;
}

h1 {
    width: 100%;
    text-align: center;
}

h2 {
    text-align: center;
    clear: both;
    padding-top: 5px;
}

.hidden {
    display: none !important;
}

#main-container {
    display: flex;
    flex-direction: column;
    height: calc(100% - 40px);
    margin: 20px;
    background: BASECOLOR;
    border-radius: 15px;
}

#title-bar {
    display: flex;
    flex-direction: row-reverse;
    align-items: center;
    width: 100%;
    height: 5.5em;
    min-height: 5.5em;
    background: BASECOLOR;
    border-radius: 15px;
    z-index: 2;
}

.welcome {
    display: flex;
    align-items: center;
    color: TEXTCOLOR;
    font-size: 1.3em;
    margin-left: 25px;
    font-weight: bold;
}

.welcome img {
    width: 28px;
    height: 28px;
    margin-right: 10px;
}

.version {
    font-size: 1em;
    margin-right: 25px;
}

.settingsicon {
    width: 22px;
    height: 22px;
    margin-left: 10px;
    vertical-align: middle;
}

@media only screen and (max-width: 1100px) {
    .welcome {
        display: none;
    }

    .version {
        display: none;
    }
}

/* --- TABS --- */

ul.tabs {
    display: flex;
    position: absolute;
    top: 2em;
    left: 50%;
    transform: translateX(-50%);
}

ul.tabs li {
    list-style: none;
}

ul.tabs li a {
    display: flex;
    align-items: center;
    border-radius: 8px;
    padding: 6px 12px;
    margin: 0 3px;
    color: TEXTCOLOR;
    text-decoration: none;
    outline: 0;
    font-size: 1.3em;
    transition: 100ms;
}

ul.tabs li a img {
    margin-right: 5px;
}

ul.tabs li a:hover {
    background-color: BOXCOLOR;
}

ul.tabs li a.active,
ul.tabs li a.active:hover {
    background-color: BOXCOLOR;
    font-weight: bold;
}

.panel {
    display: flex;
    flex-direction: column;
    color: TEXTCOLOR;
    padding: 15px;
    padding-top: 0;
    overflow: auto;
}

.footnote {
    color: BGTCOLOR;
    text-align: center;
    display: block; /* footnote tips display */
    clear: both;
    padding-top: 10px;
}

/* --- DOCUMENTS TAB --- */

.thumbnails ul {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    margin: 0;
    padding: 0;
}

ul.icons {
    clear: both;
}

.file-card {
    list-style: none;
    display: inline;
    padding: 10px 0px 15px 10px;
    width: 138px;
    height: 200px;
    background: BOXCOLOR;
    border-radius: 8px;
    margin: 10px;
    word-wrap: break-word;
}

.file-card h4 {
    margin: 3px 0;
    max-width: 90%;
}

.file-card img {
    width: 128px;
    height: 128px;
    border-radius: 4px;
}

.file-card p {
    margin: 0;
}

.caption {
    clear: both;
}

.caption p {
    font-weight: normal;
}

a .caption,
a .caption:link,
a .caption:visited {
    color: TEXTCOLOR;
    text-decoration-color: TEXTCOLOR;
}

.quickstart-button-card {
    list-style: none;
    display: flex;
    align-items: center;
    float: left;
    padding: 5px 10px;
    width: 18em;
    height: 5em;
    background: BOXCOLOR;
    border-radius: 8px;
    margin: 10px;
    word-wrap: break-word;
}

.quickstart-button-card a {
    display: flex;
}

.quickstart-button-card h3 {
    max-width: 90%;
    margin: 3px 0;
    margin-bottom: 5px;
    text-align: left;
}

.quickstart-button-card img {
    width: 64px;
    height: 64px;
    margin-right: 10px;
}

.quickstart-button-card p {
    margin: 0;
}

.notes {
    display: none; /* notes display */
    /* don't change this line */
    width: 100%;
}

#notepad {
    width: calc(100% - 30px);
    min-height: 300px;
    margin: 10px;
    color: TEXTCOLOR;
    background: BOXCOLOR;
    border: none;
    padding: 10px;
    border-radius: 8px;
}

#notepad:focus {
    outline: none;
}

/* --- HELP TAB --- */

#help-tab-wrapper {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.docbox {
    padding: 10px;
    max-width: 360px;
    background: BOXCOLOR;
    border-radius: 8px;
    margin: 10px;
}

.docbox h2 {
    text-align: center;
}

.docbox h3 {
    display: flex;
    align-items: center;
}

.docbox img {
    max-width: 24px;
    max-height: 24px;
    margin-right:10px;
}

.docbox a:hover {
    text-decoration: underline;
}

.workbenches li,
.addonslist li {
    display: flex;
    align-items: center;
    width: 50%;
    float: left;
    margin-bottom: 5px;
}

.workbenches li img {
    margin-right: 5px;
}

ul.workbenches,
ul.addonslist {
    overflow: hidden;
    padding: 10px;
}

/* --- ACTIVITY TAB --- */

.forum img {
    max-width: 100% !important;
    max-height: 100% !important;
}

.allwidth {
    max-width: 98%;
}

#commits ul {
    margin: 30px 0;
}

#commits ul li,
.forum ul li {
    margin-bottom: 10px;
}

.forum {
    display: none; /* forum display */
    /* don't change this line */
}

.forum pre {
    white-space: pre-wrap;
}

/* --- SCROLLBAR STYLE --- */

::-webkit-scrollbar {
    width: 20px;
    background: BASECOLOR;
    padding: 2px;
}

::-webkit-scrollbar-thumb {
    background: BOXCOLOR;
    -webkit-border-radius: 999px;
    background-clip: content-box;
    border: 6px solid transparent;
}

::-webkit-scrollbar-thumb:hover {
    background: TEXTCOLOR;
    background-clip: content-box;
    border: 6px solid transparent;
}