style:弹框组件重构完成

-.el-dialog {
+.dialogBox {
     border-radius: 8px;
     overflow: hidden;
     background: #FFFFFF;

 <template>
   <el-dialog :visible.sync="dialogVisible" :width="width" :fullscreen="fullscreen" top="0" :append-to-body="true"
-    :lock-scroll="true" :close-on-click-modal="false" :custom-class="isMain ? 'mainCenter' : 'contentCenter'"
-    :destroy-on-close="true" ref="dialogBox">
+    :lock-scroll="true" :close-on-click-modal="false"
+    :custom-class="isMain ? 'mainCenter dialogBox' : 'contentCenter dialogBox'" :destroy-on-close="true"
+    ref="dialogBox">
     <div slot="title" class="dialog_title" ref="dialogTitle">
       <b>{{ title }}</b>
       <div v-if="isFullscreen" class="dialog_full">
@@ -27,7 +28,7 @@ export default {
     value: { type: Boolean, default: false },
     isMain: {
       type: Boolean,
-      default: true
+      default: false
     },
     isButton: {
       type: Boolean,