Grav-Admin-Plugin/themes/grav/scss/template/_editor.scss

.uk-htmleditor {

}

.uk-htmleditor-navbar {
    @include clearfix;
    border: 1px solid $form-border;
    border-top-right-radius: $form-border-radius;
    border-top-left-radius: $form-border-radius;
    background: lighten($content-bg,5%);

    ul {
        list-style: none;

        margin: 0;
        padding: 0;



        li {
            float: left;
            &:first-child a {
                border-top-left-radius: 4px;
            }
        }
        .uk-active a {
            background: white;
            cursor: auto;
            border-left: 1px solid $form-border;
            border-right: 1px solid $form-border;
            &:hover {
                background: $white;
            }
        }

        a {
            display: block;
            cursor: pointer;
            line-height: 3rem;
            height: 3rem;
            padding: 0 1rem;
            color: $content-fg;

            &:hover {
                background: lighten($content-bg,2%);
                color: darken($content-fg,10%);
            }
        }
    }


}

.uk-htmleditor-navbar-nav {
    float: left;
}

.uk-htmleditor-navbar-flip {
    float: right;
    ul li:last-child a {
        border-top-right-radius: 4px;
    }
}

.uk-htmleditor-content {

    @include clearfix;
    border: 1px solid $form-border;
    border-top: 0;
    border-bottom-right-radius: $form-border-radius;
    border-bottom-left-radius: $form-border-radius;
}

.uk-htmleditor-code {
    .codeMirror {
        padding: 20px;
    }
}

.uk-htmleditor-preview {
    padding: 20px;
    overflow-y: scroll;
    position: relative;
    background: #fafafa;

    > div > hr:first-child {
        border-bottom: 4px solid #f00;
    }

}

#admin-main {
    .uk-htmleditor-preview {
        font-family: $font-family-default;

        h1, h2, h3, h4, h5, h6 {
            color: darken($content-fg, 10%);
        }
        h1 {
            font-size: 2rem;
            border: 0;
        }
        h2 {
            font-size: 1.6rem;
        }
        h3 {
            font-size: 1.4rem;
        }
        h4 {
            font-size: 1.2rem;
        }
        h5 {
            font-size: 1.1rem
        }
        p, h1 {
            padding: 0;
        }
    }
}

[data-mode=tab] {
    &[data-active-tab=code] .uk-htmleditor-preview, &[data-active-tab=preview] .uk-htmleditor-code {
        display: none;
    }
}

[data-mode=split] {
    .uk-htmleditor-button-code, .uk-htmleditor-button-preview {
        display: none;
    }

    .uk-htmleditor-code {
        border-right: 1px solid $form-border;

        &, .uk-htmleditor-preview {
            float: left;
            width: 50%;
        }
    }
}