vue框架下body样式一直显示不出来，求助！

Question

以下是register.vue文件

<template>
<div id="register">
  <div id="registerBox">
    <p id="registerText">注册页面</p>
    <form name="signupForm" id="signupForm">
      <div class="form-group">
        <label for="username">用户名</label>
        <input type="text" v-model="vmodel_username" id="username" placeholder="请输入中文用户名" @blur="check_username"/><br />
        <span v-show="vshow_username" style="color:red">用户名必须为中文</span>
      </div>
      <div class="form-group">
        <label for="password">密码</label>
        <input type="password" v-model="vmodel_password" id="password" placeholder="请设置不少于6位字符的密码" @blur="check_password"/><br />
        <span v-show="vshow_password" style="color:red">密码长度不能小于 6 个字符</span>
      </div>
      <div class="form-group">
        <label for="comfirmPassword">确认密码</label>
        <input type="password" v-model="vmodel_comfirmPassword" id="comfirmPassword" placeholder="请再次输入密码" @blur="check_comfirmPassword"/><br />
        <span v-show="vshow_comfirmPassword" style="color:red">与上述密码不符</span>
      </div>
      <div class="form-group">
        <label for="phone">手机号</label>
        <input type="text" v-model="vmodel_phone" id="phone" placeholder="请输入有效的手机号" @blur="check_phone"/><br />
        <span v-show="vshow_phone" style="color:red">输入的手机号格式不正确</span>
      </div>
      <div class="form-group">
        <label for="email">邮箱</label>
        <input type="email" v-model="vmodel_email" id="email" placeholder="请输入有效的邮箱地址" @blur="check_email"/><br />
        <span v-show="vshow_email" style="color:red">输入的邮箱无效</span>
      </div>
      <button type="button" id="submit" @click="submitForm">提交</button>
      <button type="reset" id="reset">重置</button>
    </form>
  </div>
</div>
</template>
<script>
export default {
  name: 'registerBox',
  components: {},
  data () {
    return {
      // 这里对应v-show
 vshow_username: false,
      vshow_password: false,
      vshow_comfirmPassword: false,
      vshow_phone: false,
      vshow_email: false,
      // 这里的变量对应v-model
 vmodel_username: '',
      vmodel_password:'',
      vmodel_comfirmPassword:'',
      vmodel_phone:'',
      vmodel_email:'',
    };
  },
  methods:{
    // 这里对应@blur
 check_username:function(){
      // 检查正则匹配
 var re_username = /^[u4e00-u9fa5]+$/;
      if(re_username.test(this.vmodel_username)){
        this.vshow_username = false;
      }
      else{
        /*this.username_msg = '用户名必须为中文';*/
 this.vshow_username = true;
        return false;
      }
    },
    check_password:function(){
      // 检查正则匹配
 var re_password =/^[a-z0-9_-]{6,18}$/;
      if(re_password.test(this.vmodel_password)){
        this.vshow_password = false;
      }
      else{
        /*this.password_msg = '密码长度不能小于 6 个字符';*/
 this.vshow_password = true;
        return false;
      }
    },
    check_comfirmPassword:function(){
      // 检查是否与password一样
 if(this.vmodel_password == this.vmodel_comfirmPassword){
        this.vshow_comfirmPassword = false;
      }
      else{
        /*this.comfirmPassword_msg = '与上述密码不符';*/
 this.vshow_comfirmPassword = true;
        return false;
      }
    },
    check_phone:function(){
      // 检查正则
 var re_phone = /^1[345789]d{9}$/;
      if(re_phone.test(this.vmodel_phone)){
        this.vshow_phone = false;
      }
      else{
        /*this.phone_msg = '输入的手机号格式不正确';*/
 this.vshow_phone = true;
        return false;
      }
    },
    check_email:function(){
      var re_email=/^[A-Za-z0-9u4e00-u9fa5]+@[a-zA-Z0-9_-]+(.[a-zA-Z0-9_-]+)+$/;
      if (re_email.test(this.vmodel_email)){
        this.vshow_email = false;
      } else {
        /* this.email_msg = '输入的邮箱无效';*/
 this.vshow_email = true;
        return false;
      }
    },
    //检验非空
 isnull:function(newValue){
      if(newValue==""||newValue==null){
        return true;
      }
    },
    submitForm:function(){
      console.log(this.vmodel_username);
      console.log(this.vmodel_password);
      console.log(this.vmodel_comfirmPassword);
      console.log(this.vmodel_email);
      console.log(this.vmodel_phone);
    /*  console.log(this.vmodel_idNo);*/
 /* console.log(this.vmodel_allow); */ var isRegister=true;
      //检验
 if(this.$options.methods.isnull(this.vmodel_username)){
        isRegister=false;
      }else if(this.$options.methods.check_username()){
        isRegister=false;
      }else if(this.$options.methods.isnull(this.vmodel_password)){
        isRegister=false;
      }else if(this.$options.methods.check_password()){
        isRegister=false;
      }else if(this.$options.methods.isnull(this.vmodel_comfirmPassword)){
        isRegister=false;
      }else if(this.$options.methods.check_comfirmPassword()){
        isRegister=false;
      }else if(this.$options.methods.isnull(this.vmodel_phone)){
        isRegister=false;
      }else if(this.$options.methods.check_phone()){
        isRegister=false;
      }else if(this.$options.methods.isnull(this.vmodel_email)){
        isRegister=false;
      }else if(this.$options.methods.check_email()){
        isRegister=false;
      }
      if(isRegister){
        alert("注册成功!");
        /* window.location.href="success.html"; */
 }else{
        alert("注册失败!");
      }
    }
  }
}
</script>
<style scoped>
@import "../assets/register.css";
</style>

以下是css代码

button {
  height:15px;
  width: 10px;
  margin:35px;  /*margin是四个边距，所有四个边距都是 10px*/ border-radius: 10px;
  text-align: center;
  font-family: 'Source Sans Pro', sans-serif;
  font-size: 20px;
  float: right;
  border: 1px solid #269ABC;
  outline: none; /*设置元素周围的轮廓*/
 margin-left: 18%;
}
button:hover{
  font-weight: bold;
  color: #020002ab;
  box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24), 0 17px 50px 0 rgba(0,0,0,0.19);
}
button:active {
  transform: translateY(4px);
}
body{
  height:100%;
  width:100%;
  background-image: linear-gradient(lightskyblue, lightblue);
  background-size: cover;
  background-attachment: fixed;
}
#registerBox{
  background-color: rgba(215, 223, 226, 0.7);
  position: absolute;
  top:50%;
  left:50%;
  transform: translate(-50%,-50%);
  text-align: center;
  width:400px;
  padding-bottom: 2px;
  border-radius: 15px;
}
@keyframes myfirst
{
  0% {left:0px; top:0px;}
  25% {left:200px; top:0px;}
}
form{
  padding:0px 20px;
}
label{
  display:inline-block;
  width:80px;
  text-align:left;
  font-size: 20px;
 /* font-weight: bold;*/
}
input{
  width:250px;
  height:40px;
  /*display: block;*//*设置成块级元素，独占一行*/
 margin: 5px auto;/*外边距30px，输入框居中*/
 padding: 8px;/*设置内边距*/
 text-align: center;/*文字居中*/
 border: 1px solid #EBEBEB;/*把输入框包起来，变成长方形*/
 border-radius: 10px;/*让长方形的4个角弯一点，*/
 font-family: 'Source Sans Pro', sans-serif;/*字体类型*/
 font-size: 18px;/*字体大小*/
 outline: none;
}
#submit,#reset{
  margin-top:10px;
  background-color: #fff;
  width:80px;
  height:30px;
}
#registerText{
  margin-top:18px; /*margin-top 属性设置元素的上外边距*/
 padding-bottom: 10px;  /*下内边距*/
 border-bottom: 1px solid rgb(240, 240, 245); /*设置下边框的样式width,style,color*/
 font-size:25px;
  text-shadow: 5px 5px 5px skyblue;
}
/*div{
 display:inline-block; height:30px; width:100%;}*/
/*hover 鼠标移动到div上时*/
div:hover {
  -webkit-transition: border linear .2s, -webkit-box-shadow linear .5s;
  /*鼠标移动是过渡*/
 box-shadow: 0px 0px 100px #FFFFFF/*四边出现阴影，效果发光*/
}

body的样式为什么就是不能显示？？？
当我把scope去掉后，发现就能显示了

可是返回前一张页面的话，前一张的页面又错乱了

有没有两全的办法既能显示背景，又不使前面页面样式错乱，望大佬不吝赐教！

Answer 1

scoped的作用域，因为权重的问题，scoped的设计思想就是让当前组件的样式不会修改到其它地方的样式,保证css的作用域不会变成全局 而被其它模块的css污染