1.解决： el-pagination 标签中加 popper-class=‘select_bottom’
css代码：
.select_bottom {
z-index: 2008; position: absolute; left: 147px !important; top: 355px !important; margin: 0px;
border: 1px solid #55aaff;
.el-select-dropdown {
}
.el-select-dropdown {
background-color: #ffffff;
}
.el-select-dropdown__item.selected {
color: red;
}
.el-select-dropdown__item.hover,
.el-select-dropdown__item:hover {
background: red;
color: #fff;
}
}
2.效果 
