element-plus中el-input中icon显示超出input

            <el-form 
            ref="ruleFormRef" 
            :model="ruleForm" 
            :rules="rules" 
            label-width="400px"
            label-position="top"
            size:large
            >
                <h1>Welcome Login</h1>
                <el-form-item prop="username">
                    <el-input
                    :prefix-icon="User"
                    clearable 
                    v-model="ruleForm.username"
                    placeholder="请输入账号"
                    >
                </el-input>
                </el-form-item>
                <br>
                <el-form-item prop="password">
                    <el-input
                        v-model="ruleForm.password"
                        placeholder="请输入密码"
                        type="password"
                        show-password
                    >
                    <template #prefix>
                        <el-icon class="el-input__icon"><Lock /></el-icon>
                    </template>
                    </el-input>
                </el-form-item>
                <br>
                <el-form-item>
                    <el-button type="success" @click.native.prevent="login('form')">Login</el-button>
                </el-form-item>
            </el-form>
        </el-card>
    </div>
</div>