fair-web/static/self/monaco-editor.css

.editor {
    background: #fff;
    position: relative;
    border: 1px solid rgba(34, 36, 38, 0.15);
}

.editor.editor-with-border {
    border-radius: .28571429rem;
    overflow: hidden;
    outline: none;
}

.editor.editor-with-border:focus-within {
    border-color: #85b7d9;
}

.editor.editor-with-border .monaco-editor .margin {
    visibility: hidden;
}

.editor.editor-with-border .monaco-editor .lines-content.monaco-editor-background {
    margin-top: 9px;
    margin-left: 4px;
}

.monaco-editor .inputarea {
    min-height: 0 !important;
    padding: 0 !important;
    border: 0 !important;
    color: rgba(0, 0, 0, 0) !important;
}

.monaco-editor-background.textAreaCover.line-numbers {
    visibility: hidden;
}

.monaco-editor .selected-text, .monaco-editor .monaco-editor-background {
    border-radius: 0 !important;
}

.monaco-editor .mtk1 {
    color: #4d4d4c !important;
}

.monaco-editor .cursor {
    color: #000 !important;
    border-color: #000 !important;
    background-color: #000 !important;
}

.monaco-editor .line-numbers {
    color: #575756 !important;
}

.monaco-editor .margin-view-overlays .current-line ~ .line-numbers {
    color: #000 !important;
    font-weight: 500;
}

.editor.editor-with-border .monaco-editor .monaco-scrollable-element .scrollbar.vertical {
    background: rgba(0,0,0,.1);
    border-radius: 0;
}

.editor.editor-with-border .monaco-editor .monaco-scrollable-element .scrollbar.vertical .slider {
    border-radius: 5px;
    background: rgba(0,0,0,.25);
    -webkit-transition: color .2s ease;
    transition: color .2s ease;
}