fixed issue 389

[Ayush-may]

PR Description 📜

1. in about page timeline isnt at center
2. so i use justify-content: center; to make it center

`.line4 {

display: flex;
flex-direction: row;
justify-content: center;
}`

Fixes #389

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## Add your screenshots(Optional) 📸

now this is at center

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Name	Status	Preview	Comments	Updated (UTC)
community-page	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 24, 2024 8:54am