diff --git a/IPython/html/static/style/ipython.min.css b/IPython/html/static/style/ipython.min.css
index 8d4fade..a27f6cc 100644
--- a/IPython/html/static/style/ipython.min.css
+++ b/IPython/html/static/style/ipython.min.css
@@ -8,19 +8,19 @@
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 .vbox{display:-webkit-box;-webkit-box-orient:vertical;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:vertical;-moz-box-align:stretch;display:box;box-orient:vertical;box-align:stretch;width:100%;display:flex;flex-direction:column;align-items:stretch}
 .vbox>*{-webkit-box-flex:0;-moz-box-flex:0;box-flex:0;flex:none}
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 .box-group1{-webkit-box-flex-group:1;-moz-box-flex-group:1;box-flex-group:1}
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-.start{-webkit-box-pack:start;-moz-box-pack:start;box-pack:start;justify-content:flex-start}
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-.align-center{-webkit-box-align:center;-moz-box-align:center;box-align:center;align-items:center}
+.hbox.start,.vbox.start,.start{-webkit-box-pack:start;-moz-box-pack:start;box-pack:start;justify-content:flex-start}
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+.hbox.center,.vbox.center,.center{-webkit-box-pack:center;-moz-box-pack:center;box-pack:center;justify-content:center}
+.hbox.align-start,.vbox.align-start,.align-start{-webkit-box-align:start;-moz-box-align:start;box-align:start;align-items:flex-start}
+.hbox.align-end,.vbox.align-end,.align-end{-webkit-box-align:end;-moz-box-align:end;box-align:end;align-items:flex-end}
+.hbox.align-center,.vbox.align-center,.align-center{-webkit-box-align:center;-moz-box-align:center;box-align:center;align-items:center}
 div.error{margin:2em;text-align:center}
 div.error>h1{font-size:500%;line-height:normal}
 div.error>p{font-size:200%;line-height:normal}
diff --git a/IPython/html/static/style/style.min.css b/IPython/html/static/style/style.min.css
index e36a823..66a8a54 100644
--- a/IPython/html/static/style/style.min.css
+++ b/IPython/html/static/style/style.min.css
@@ -1271,19 +1271,19 @@ a .icon-rotate-90:before,a .icon-rotate-180:before,a .icon-rotate-270:before,a .
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 .vbox{display:-webkit-box;-webkit-box-orient:vertical;-webkit-box-align:stretch;display:-moz-box;-moz-box-orient:vertical;-moz-box-align:stretch;display:box;box-orient:vertical;box-align:stretch;width:100%;display:flex;flex-direction:column;align-items:stretch}
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 .box-group1{-webkit-box-flex-group:1;-moz-box-flex-group:1;box-flex-group:1}
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+.hbox.start,.vbox.start,.start{-webkit-box-pack:start;-moz-box-pack:start;box-pack:start;justify-content:flex-start}
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+.hbox.center,.vbox.center,.center{-webkit-box-pack:center;-moz-box-pack:center;box-pack:center;justify-content:center}
+.hbox.align-start,.vbox.align-start,.align-start{-webkit-box-align:start;-moz-box-align:start;box-align:start;align-items:flex-start}
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+.hbox.align-center,.vbox.align-center,.align-center{-webkit-box-align:center;-moz-box-align:center;box-align:center;align-items:center}
 div.error{margin:2em;text-align:center}
 div.error>h1{font-size:500%;line-height:normal}
 div.error>p{font-size:200%;line-height:normal}