perf[login.vue]: Improve input background and cursor color (#927)

* 完善input背景和光标色;

1.完善在Chrome浏览器时登陆界面的input标签 使用记住密码之后颜色和背景不一致;
2.目前的rgb值是 #2d3a4b  修改的rgb值是 #283443;
3.修复光标使用Chrome记录的账号之后变黑色;
4.移除 .title-container .title 重复的font-weight: 400;
5.不用IE我们大家都是好朋友！~

* Update index.vue

src/views/login/index.vue

@@ -142,36 +142,50 @@ export default {
 </script>
 
 <style rel="stylesheet/scss" lang="scss">
-$bg:#2d3a4b;
-$light_gray:#eee;
+  /* 修复input 背景不协调 和光标变色 */
+  /* Detail see https://github.com/PanJiaChen/vue-element-admin/pull/927 */
  
-/* reset element-ui css */
-.login-container {
-  .el-input {
-    display: inline-block;
-    height: 47px;
-    width: 85%;
-    input {
-      background: transparent;
-      border: 0px;
-      -webkit-appearance: none;
-      border-radius: 0px;
-      padding: 12px 5px 12px 15px;
-      color: $light_gray;
-      height: 47px;
-      &:-webkit-autofill {
-        -webkit-box-shadow: 0 0 0px 1000px $bg inset !important;
-        -webkit-text-fill-color: #fff !important;
+  $bg:#283443;
+  $light_gray:#eee;
+  $cursor: #fff;
+
+  @supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
+    .login-container .el-input input{
+      color: $cursor;
+      &::first-line {
+        color: $light_gray;
       }
     }
   }
-  .el-form-item {
-    border: 1px solid rgba(255, 255, 255, 0.1);
-    background: rgba(0, 0, 0, 0.1);
-    border-radius: 5px;
-    color: #454545;
+
+  /* reset element-ui css */
+  .login-container {
+    .el-input {
+      display: inline-block;
+      height: 47px;
+      width: 85%;
+      input {
+        background: transparent;
+        border: 0px;
+        -webkit-appearance: none;
+        border-radius: 0px;
+        padding: 12px 5px 12px 15px;
+        color: $light_gray;
+        height: 47px;
+        caret-color: $cursor;
+        &:-webkit-autofill {
+          -webkit-box-shadow: 0 0 0px 1000px $bg inset !important;
+          -webkit-text-fill-color: $cursor !important;
+        }
+      }
+    }
+    .el-form-item {
+      border: 1px solid rgba(255, 255, 255, 0.1);
+      background: rgba(0, 0, 0, 0.1);
+      border-radius: 5px;
+      color: #454545;
+    }
   }
-}
 </style>
 
 <style rel="stylesheet/scss" lang="scss" scoped>
@@ -216,7 +230,6 @@ $light_gray:#eee;
     position: relative;
     .title {
       font-size: 26px;
-      font-weight: 400;
       color: $light_gray;
       margin: 0px auto 40px auto;
       text-align: center;