style the individual blog view

还没有人认领这个 Issue。

**Is your feature request related to a problem? Please describe.**
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
the individual blog view is styled really poorly. The data is there but it doesn't look great.

**Describe the solution you'd like**
A clear and concise description of what you want to happen.
The image should be smaller. title and body should have some styling etc

**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features you've considered.

**Additional context**
Add any other context or screenshots about the feature request here.

首先定位单个博客视图的入口点，并检查当前如何渲染其图像、标题和正文。比较应用样式前后的页面；完成的标准是图像变小，标题和正文具有有意设计的样式，同时视图仍然易于阅读。

由索引模型根据 Issue 内容生成。