Bước 1: Vào chủ đề --> Tùy chỉnh --> chỉnh sửa HTML tìm ]]></b:skin> thêm đoạn code này bên trên nó.
.fill{position:absolute;top:0;left:0;height:100%;right:0;bottom:0;z-index:1}
.no-click{pointer-events:none}
@keyframes rain{0%{background-position:0 0}100%{background-position:500px 1000px}}
.effect-rain{background-image:url("https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPq6Eydll2-RX-LYXTEyYyG5tuPiAu0d_6BS9581gEYkIpG2Gr7Gt5M8AslR5sGc94ahUteyVq_WcC4pBxRiHhhyphenhyphen9zMH1J7zRV_JDzSojUCZh9P73xr63HDHGdzSnmUSF7aYIogsaWijvz/s93/rain.png");animation:rain 2s linear infinite}
@keyframes sparkle{0%{background-position:0 0,0px 0,0px 0}100%{background-position:-500px -1000px,-400px -400px,300px 300px}}
.effect-sparkle{background-image:url("https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZdIIUcWFdxd9U0D4VcEH2MGprXXIUK_9obZ3ugDCWSpuCtp15NMYi7_paWtB6q067hDTl7gjVNdaTI2JUEI0ixf_KrRlnTUAkjgB-Z5WiRUZrFLDHQ-rxfD60A3pZ7tyBHHedZTQNJZt0/s500/sparkle1.png"),url("https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhri73uMJh-gk7T7DZLSn6z1AcKAO7wKmzwL-lMFxAPxsnRNX0LX8iH64xA4VAhDbKmdZLf1nDZO8wdOGFRWjYTBuBsPrwoWfhc8BpnUXwgopkdouhUxY2oq7rlLyPHzzHSYWHAgG_TdlQK/s400/sparkle2.png");animation:sparkle 60s linear infinite}
@keyframes glass{0%{background-position:0 0,0px 0,0px 0}100%{background-position:500px 1000px,400px 400px}}
.effect-sliding-glass{background-image:url("https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEidK0eaxWjObzOYZqxD7VPYIWlrmadcyfRW7aK-tAUyJ0fXsY7OKgJWIkLAMiLIBE5rTDatySghnPWzxDz8TUeShysmAtQ3RZfG5umg1RNOCi8oQ71RCD3mCfJzXLTDeDOxhRayv9RLnFzA/s500/glass1.png"),url("https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj9WJmjCvYP2s_I8Bm6CG9jHH1_SiOzdlILW44rUB84cZKpIv9Dj6GE0AZwvsZ6ySYKb2gogXYHj3LWf0DZvKSkRZK76MG2ufRdF1kHGgW47W8xsdftB-_3IEghjBe8uQKGmV-_5SUtdl8R/s500/glass2.png");animation:glass 30s linear infinite}
@keyframes confetti{0%{background-position:0 0,0px 0,0px 0}100%{background-position:500px 1000px,400px 400px,300px 300px}}
.effect-confetti{background-image:url("https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5xzuB51w9bR7D3MHWlZFHHlJ2itCktGrSumaSOCpUxiLA_uw8oNmrnh9MwI7VAH8QBnPDnP1u8vfMLjoVOMCR9VsEvgVWCVcwuAnm8MYj8uVxbnQPZUI5_fMeJDfI5BcZ__hcFoJcLZ0w/s500/confetti1.png"),url("https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjOlv_0aqhtGfc_sZ-Uf07XdJ9SuPMx7So3yPGMBF-r01WtY-lwBAvIDCyE0uxTtnkiSxAkXRXxG9__J6wQkyXnVSe5UaD85KqYzDcpwceqtQA4Wiqmv46FefH8LEMxTVOq9uflFumRf8C6/s400/confetti2.png");animation:confetti 10s linear infinite}
@keyframes snow{0%{background-position:0 0,0px 0,0px 0}100%{background-position:500px 1000px,400px 400px,300px 300px}}
.effect-snow{background-image:url("https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiv46zhnIbwf5ZIsJgUfQquhqmWnlYp9raiGV3A9Ko6k8_RZS9NaUPu_3WjSh14dqHuRn7XGgu9ngi5Jr_KxTWSwxSTSV4Z1xTugyRkfxCE5qY-Y8U_A3JSTYh-mUXlbhyphenhyphenzWn2C5I5bbJVn/s500/snow1.png"),url("https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjSHBlrNnAbLbxz29acQOkJItsnniwOn5Ij8AaPGSgyrWHcLPEDqt2a33J9kAKgLjZ3mpMM_mSYK9-lBAoSKY-QBJ0kL4lYoawmbmUGSx_GymCYW2G7Wdhc4bvtsQQCWgAPq1iD-leLrvgc/s400/snow2.png");animation:snow 20s linear infinite}Bước 2: Tìm đến thẻ <body> và chèn đoạn code dưới đây
<div class='fill effect-snow no-click'></div>
Thay đổi effect-snow thành một hiệu ứng khác:
- effect-snow hiệu ứng tuyết rơi
- effect-rain hiệu ứng mưa
- effect-sliding-glass hiệu ứng ánh sáng
- effect-confetti hiệu ứng pháo sinh nhật
- sparkle hiệu ứng bong bóng (theo mình là hiệu ứng đẹp nhất)
Bước 3: Nhấn nút Save
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