感谢Jacob peattie mozboz，事实上，我们可以调整css使其成为我的twentyseventeen 主题我找到一个名为editor.css. 我在我的style.css 文件（我不确定这是不是最好的地方，因为我只有2页40页上有WYSIWYG字段）。

我觉得很奇怪，我必须为此编写自定义css，我不明白为什么我的主题是；不兼容；。

谢谢

/* Editors */
.wp-editor-wrap {
    position: relative;
}

.wp-editor-tools {
    position: relative;
    z-index: 1;
}

.wp-editor-tools:after {
    clear: both;
    content: "";
    display: table;
}

.wp-editor-container {
    clear: both;
    border: 1px solid #e5e5e5;
}

.wp-editor-area {
    font-family: Consolas, Monaco, monospace;
    font-size: 13px;
    padding: 10px;
    margin: 1px 0 0;
    line-height: 150%;
    border: 0;
    outline: none;
    display: block;
    resize: vertical;
    box-sizing: border-box;
}

.rtl .wp-editor-area {
    font-family: Tahoma, Monaco, monospace;
}

.locale-he-il .wp-editor-area {
    font-family: Arial, Monaco, monospace;
}

.wp-editor-container textarea.wp-editor-area {
    width: 100%;
    margin: 0;
    box-shadow: none;
}

.wp-editor-tabs {
    float: right;
}

.wp-switch-editor {
    float: left;
    box-sizing: content-box;
    position: relative;
    top: 1px;
    background: #ebebeb;
    color: #666;
    cursor: pointer;
    font-size: 13px;
    line-height: 1.46153846;
    height: 20px;
    margin: 5px 0 0 5px;
    padding: 3px 8px 4px;
    border: 1px solid #e5e5e5;
}

.wp-switch-editor:focus {
    box-shadow:
        0 0 0 1px #5b9dd9,
        0 0 2px 1px rgba(30, 140, 190, 0.8);
    outline: none;
    color: #23282d;
}

.wp-switch-editor:active,
.html-active .switch-html:focus,
.tmce-active .switch-tmce:focus {
    box-shadow: none;
}

.wp-switch-editor:active {
    background-color: #f5f5f5;
    box-shadow: none;
}

.js .tmce-active .wp-editor-area {
    color: #fff;
}

.tmce-active .quicktags-toolbar {
    display: none;
}

.tmce-active .switch-tmce,
.html-active .switch-html {
    background: #f5f5f5;
    color: #555;
    border-bottom-color: #f5f5f5;
}

.wp-media-buttons {
    float: left;
}

.wp-media-buttons .button {
    margin-right: 5px;
    margin-bottom: 4px;
    padding-left: 7px;
    padding-right: 7px;
}

.wp-media-buttons .button:active {
    position: relative;
    top: 1px;
    margin-top: -1px;
    margin-bottom: 1px;
}

.wp-media-buttons .insert-media {
    padding-left: 5px;
}

.wp-media-buttons a {
    text-decoration: none;
    color: #444;
    font-size: 12px;
}

.wp-media-buttons img {
    padding: 0 4px;
    vertical-align: middle;
}

.wp-media-buttons span.wp-media-buttons-icon {
    display: inline-block;
    width: 20px;
    height: 20px;
    line-height: 1;
    vertical-align: middle;
    margin: 0 2px;
}

.wp-media-buttons .add_media span.wp-media-buttons-icon {
    background: none;
}

.wp-media-buttons .add_media span.wp-media-buttons-icon:before {
    font: normal 18px/1 dashicons;
    speak: none;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.wp-media-buttons .add_media span.wp-media-buttons-icon:before {
    content: "\\f104";
}

.mce-content-body dl.wp-caption {
    max-width: 100%;
}