style(css): 调整消息容器的间距 #60

Job	Run time
Test on Ubuntu	40s
Test on Windows	3m 19s
Test on macOS	30s
Build macOS binaries (x86_64-apple-darwin)	2m 57s
Build macOS binaries (aarch64-apple-darwin)	3m 7s
Build Linux binaries (x86_64-unknown-linux-gnu)	6m 2s
Build Linux binaries (i686-unknown-linux-gnu)	5m 40s
Build Linux binaries (armv7-unknown-linux-gnueabihf)	4m 31s
Build Linux binaries (riscv64gc-unknown-linux-gnu)	4m 22s
Build Linux binaries (aarch64-unknown-linux-gnu)	4m 32s
Build Android binary	1m 23s
Build Windows binaries (x86_64-pc-windows-msvc)	7m 57s
Build Windows binaries (i686-pc-windows-msvc)	7m 21s
Build Windows binaries (aarch64-pc-windows-msvc)	8m 10s
Create GitHub Release	0s
	1h 0m 31s

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