fix button center

pages/index.vue

@@ -28,7 +28,9 @@
             type="password"
             class="form-control mb-3"
             placeholder="password"
-            min=""
+            oninput="javascript: if (this.value.length > this.maxLength) this.value = this.value.slice(0, this.maxLength);"
+            maxlength = "16"
+            min="6"
             required
           />
           <b-form-checkbox
@@ -41,9 +43,11 @@
           >
             Remember me
           </b-form-checkbox>
-          <button class="w-100 btn btn-lg btn-primary" type="submit">
+          <div class="col text-center ">
+          <button class="w-30 btn btn-lg btn-primary text-center" type="submit">
             Sign in
           </button>
+        </div>
         </form>
       </div>
     </div>