Custom Crayon Theme (Inspired by the IntelliJ IDEA Light Theme)

rieckpil.css

.crayon-theme-rieckpil {
    border-width: 0px !important;
    border-color: #999 !important;
    border-style: solid !important;
    text-shadow: none !important;
    background: #fdfdfd !important;
}
.crayon-theme-rieckpil-inline {
    border-width: 1px !important;
    border-color: #ddd !important;
    border-style: solid !important;
    background: #fafafa !important;
}
.crayon-theme-rieckpil .crayon-table .crayon-nums {
    background: #F4F4F4 !important;
    color: #000000 !important;
    border-right-width: 0px !important;
    border-right-color: #008000 !important;
    border-right-style: solid !important;
}
.crayon-theme-rieckpil .crayon-striped-line {
    background: #f7f7f7 !important;
}
.crayon-theme-rieckpil .crayon-striped-num {
    background: #dddd !important;
    color: #000000 !important;
}
.crayon-theme-rieckpil .crayon-marked-line {
    background: #fffee2 !important;
    border-width: 1px !important;
    border-color: #e9e579 !important;
}
.crayon-theme-rieckpil .crayon-marked-num {
    color: #000000 !important;
    background: #eee !important;
    border-width: 1px !important;
    border-color: #eee !important;
}
.crayon-theme-rieckpil .crayon-marked-line.crayon-striped-line {
    background: #faf8d1 !important;
}
.crayon-theme-rieckpil .crayon-marked-num.crayon-striped-num {
    background: #eee !important;
    color: #000000 !important;
}
.crayon-theme-rieckpil .crayon-marked-line.crayon-top {
    border-top-style: solid !important;
}
.crayon-theme-rieckpil .crayon-marked-num.crayon-top {
    border-top-style: solid !important;
}
.crayon-theme-rieckpil .crayon-marked-line.crayon-bottom {
    border-bottom-style: solid !important;
}
.crayon-theme-rieckpil .crayon-marked-num.crayon-bottom {
    border-bottom-style: solid !important;
}
.crayon-theme-rieckpil .crayon-info {
    background: #faf9d7 !important;
    border-bottom-width: 1px !important;
    border-bottom-color: #b1af5e !important;
    border-bottom-style: solid !important;
    color: #7e7d34 !important;
}
.crayon-theme-rieckpil .crayon-toolbar {
    background: #F4F4F4 !important;
    border-bottom-width: 1px !important;
    border-bottom-color: #BBB !important;
    border-bottom-style: solid !important;
}
.crayon-theme-rieckpil .crayon-toolbar > div {
    float: left !important;
}
.crayon-theme-rieckpil .crayon-toolbar .crayon-tools {
    float: right !important;
}
.crayon-theme-rieckpil .crayon-title {
    color: #333 !important;
}
.crayon-theme-rieckpil .crayon-language {
    color: #999 !important;
}
.crayon-theme-rieckpil .crayon-button {
    background-color: #F4F4F4 !important;
}
.crayon-theme-rieckpil .crayon-button:hover {
    background-color: #EEE !important;
    color: #666;
}
.crayon-theme-rieckpil .crayon-button.crayon-pressed:hover {
    background-color: #EEE !important;
    color: #666;
}
.crayon-theme-rieckpil .crayon-button.crayon-pressed {
    background-color: #BCBCBC !important;
    color: #FFF;
}
.crayon-theme-rieckpil .crayon-button.crayon-pressed:active {
    background-color: #BCBCBC !important;
    color: #FFF;
}
.crayon-theme-rieckpil .crayon-button:active {
    background-color: #BCBCBC !important;
    color: #FFF;
}
.crayon-theme-rieckpil .crayon-pre .crayon-c {
    color: #808080 !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-s {
    color: #008000 !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-p {
    color: #000000 !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-ta {
    color: #000000 !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-k {
    color: #000080 !important;
    font-weight: bold !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-st {
    color: #000080 !important;
    font-weight: bold !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-r {
    color: #000080 !important;
    font-weight: bold !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-t {
    color: #000080 !important;
    font-weight: bold !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-m {
    color: #000080 !important;
    font-weight: bold !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-i {
    color: #000000 !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-e {
    color: #000000 !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-v {
    color: #000000 !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-cn {
    color: #0828fb !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-o {
    color: #000000 !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-sy {
    color: #000000 !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-n {
    color: #808000 !important;
    font-style: italic !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-f {
    color: #000000 !important;
}
.crayon-theme-rieckpil .crayon-pre .crayon-h {
    color: #006fe0 !important;
}

Copy the content and create a rieckpil folder within the Crayon themes/ folder and paste it to a file called rieckpil.css. Next, refresh the Crayon settings page in your WordPress web interface and select the theme from the list.

If you want to rename this theme, replace all occurrences of rieckpil with yourtheme.

Ensure you're using the correct file permission for your web server to access the folder and the .css file. (hint sudo chown -R www-data:www-data rieckpil/)