#app{font-family:Avenir,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-align:center;color:#2c3e50;margin-top:60px}.mian1{width:295px;height:50px;margin-left:150px}.mian2{width:1900px;height:884px}.mian3{width:1016px;height:692px;align-self:center}.content{display:flex;flex-direction:column}.marginBottom{margin-bottom:20px}.tip{margin-top:50px;font-size:14px;color:#6a6a6a;cursor:pointer}