assets/scss/datepicker.scss

@@ -70,6 +70,15 @@
       .v-icon {
         color: map-deep-get($config, #{$theme}, "v-icon-chevron-down") !important;
       }
+
+      .v-select .v-input__slot {
+        border-radius: 8px !important;
+        border: solid 1px map-deep-get($config, #{$theme}, "tui-datepicker-border-color") !important;
+      }
+    
+      .v-select fieldset {
+        border: none;
+      } 
     }
 
     .v-input__custom {

components/common/DatepickerTimeSelectBox.vue

@@ -549,5 +549,10 @@ export default {
       color: #000 !important;
     }
   }
+
+	.datepicker-timeselect .v-input__slot {
+		margin: 3px;
+	}
+
 }
 </style>