#app{font-family:Avenir,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;color:#2c3e50}.header-content{display:flex;justify-content:space-between;align-items:center}.message-list{height:500px;overflow-y:auto}.el-card{height:100%}.clearfix:after,.clearfix:before{display:table;content:""}.clearfix:after{clear:both}