#app{
    width: 1000px;
    margin: 0 auto;
}
.flexSpace{
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
}
.el-input,
.choosePlatform{
    width: 30%;
    margin-top: 30px;
}
.choosePlatform{
    border: 1px solid #DCDFE6;
    border-radius: 4px;
    color: #606266;
    height: 40px;
    line-height: 40px;
    padding: 0 15px;
    box-sizing: border-box;
}

.choosePlatform > span{
    margin-right: 10px;
}
.btn{
    text-align: center;
    margin-top: 30px;
}

.btn button{
    width: 12%;
}