[Feature Request] Carousel

### Existing Component
是

### Component Name
Carousel

### Description
After you use el-main container and set the container height to 3600px, there will be some problems when using the carousel.
used：

.image{
top:0px;
max-width: 100%;
max-height: 100%;
}

No picture will appear in the carousel and there will be lose indicator.If you change height = "2000px",you can see the picture and the indicator near the top of the picture

used：

you can display the picture normally but the indicator is around 1000px below the entire carousel.