[Bug Report] css编译打包报错

### Element UI version
2.15.12

### OS/Browsers version
mac os 16

### Vue version
2.7.14

### Reproduction Link
https://github.com/ElemeFE/element

### Steps to reproduce
运行编译

### What is Expected?
编译成功

### What is actually happening?
编译失败，
./node_modules/_element-ui@2.15.12@element-ui/lib/theme-chalk/index.css (./node_modules/_css-loader@0.28.3@css-loader??ref--2-1!./node_modules/_postcss-loader@4.0.2@postcss-loader/dist/cjs.js!./node_modules/_sass-loader@8.0.2@sass-loader/dist/cjs.js??ref--2-3!./node_modules/_element-ui@2.15.12@element-ui/lib/theme-chalk/index.css)
Module build failed (from ./node_modules/_sass-loader@8.0.2@sass-loader/dist/cjs.js):
SassError: Invalid CSS after "...ttom:4px;color:": expected expression (e.g. 1px, bold), was "#00073;font-size:14"
on line 2 of /newdata/builds/0b9904e1/0/XiaoeFE/course_admin_fe/node_modules/_element-ui@2.15.12@element-ui/lib/theme-chalk/index.css
>> l-statistic .head{margin-bottom:4px;color:#00073;font-size:14px}.el-statisti
------------------------------------------^
SassError: SassError: Invalid CSS after "...ttom:4px;color:": expected expression (e.g. 1px, bold), was "#00073;font-size:14"
on line 2 of /newdata/builds/0b9904e1/0/XiaoeFE/course_admin_fe/node_modules/_element-ui@2.15.12@element-ui/lib/theme-chalk/index.css
>> l-statistic .head{margin-bottom:4px;color:#00073;font-size:14px}.el-statisti
------------------------------------------^

Start by reproducing the compilation failure described in the issue and inspect node_modules/_element-ui@2.15.12@element-ui/lib/theme-chalk/index.css. Check the SassError around line 2, where color:#00073 is reported, then determine the cause of the invalid CSS and verify that compilation succeeds without the error.

Written by the indexing model from the issue text.