wp-includes/blocks/html/editor.min.css

.block-library-html__edit .block-library-html__preview-overlay{height:100%;left:0;position:absolute;top:0;width:100%}.block-library-html__edit .block-editor-plain-text{background:#fff!important;border:1px solid #1e1e1e!important;border-radius:2px!important;box-shadow:none!important;box-sizing:border-box;color:#1e1e1e!important;direction:ltr;font-family:Menlo,Consolas,monaco,monospace!important;font-size:16px!important;max-height:250px;padding:12px!important}@media (min-width:600px){.block-library-html__edit .block-editor-plain-text{font-size:13px!important}}.block-library-html__edit .block-editor-plain-text:focus{border-color:var(--wp-admin-theme-color)!important;box-shadow:0 0 0 1px var(--wp-admin-theme-color)!important;outline:2px solid #0000!important}