JS Drum Kit
μκ³ λ§λ€κΈ° transition-timing-function : μμμ μμ§μ κΈ°λ₯μ μ μνλ κ² cubic-bezier(n,n,n,n) λ°°μ§μ΄ 곑μ κ°μ λ§λ€μ΄μ μλ μ€μ )