miniprogram-demo/pages/component/webrtc/webrtc.wxss

.log-list {
  display: flex;
  flex-direction: column;
  padding: 40rpx;
}
.log-item {
  margin: 10rpx;
}
.my-webrtc-video{
  width: 300px;
  height: 200px;
  display: block;
  border: 1px solid green;
}