Corrected CSS values for Flexbox model for official CSS3 & for IE.
Corrected CSS values for Flexbox model for official CSS3 & for IE.

tzq668766/learnGitBranching,julie1013/learnGitBranching,pcottle/learnGitBranching,myopensrc/learnGitBranching,behind2/learnGitBranching,HoldenMills/learnGitBranching,hugo-/learnGitBranching,resource11/learnGitBranching,yyn835314557/learnGitBranching,pcottle/learnGitBranching,gcbeyond/learnGitBranching,iambocai/learnGitBranching,USIU-Hackathon/learnGitBranching,thy09/learnGitBranching,xumeng/learnGitBranching,Maximaximum/learnGitBranching,codevlabs/learnGitBranching,hoharu/learnGitBranching,ranjith068/learnGitBranching,abecerramatias/GitBranching,gdseller/learnGitBranching,WilBeCoding/learnGitBranching,iambocai/learnGitBranching,alskjstl/learnGitBranching,linglaiyao1314/learnGitBranching,Haemaru/learnGitBranching,andriymoroz/learnGitBranching,myopensrc/learnGitBranching,bopo/learnGitBranching,ranjith068/learnGitBranching,kaaass/learnGitBranching,lxbyes/learnGitBranching,WilBeCoding/learnGitBranching,hoharu/learnGitBranching,YihanWang2015/learnGitBranching,resource11/learnGitBranching,Haemaru/learnGitBranching,HoldenMills/learnGitBranching,gcbeyond/learnGitBranching,DD-L/learnGitBranching,alexeiberkov/learnGitBranching,alexeiberkov/learnGitBranching,hugo-/learnGitBranching,jiyiren/learnGitBranching,lichenbuliren/learnGitBranching,julie1013/learnGitBranching,abecerramatias/GitBranching,yyn835314557/learnGitBranching,alskjstl/learnGitBranching,bopo/learnGitBranching,edombowsky/learnGitBranching,luthfi401/learnGitBranching,william0503/learnGitBranching,Maximaximum/learnGitBranching,william0503/learnGitBranching,USIU-Hackathon/learnGitBranching,lichenbuliren/learnGitBranching,pcottle/learnGitBranching,thy09/learnGitBranching,behind2/learnGitBranching,edombowsky/learnGitBranching,luthfi401/learnGitBranching,xumeng/learnGitBranching,tzq668766/learnGitBranching,DD-L/learnGitBranching,gdseller/learnGitBranching,lxbyes/learnGitBranching,Hydex/learnGitBranching,kaaass/learnGitBranching,Hydex/learnGitBranching,linglaiyao1314/learnGitBranching,jiyiren/learnGitBranching,andriymoroz/learnGitBranching,codevlabs/learnGitBranching,YihanWang2015/learnGitBranching