Do I not understand the flex-grow property?

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You have to specify a value for flex-basis as well (not specifying this property causes behaviour similar to using the initial value, auto).

Add flex-basis: 0; to both children or just set it with the shorthand:

.flex-item {
    flex: 1; /* flex-basis is 0 if omitted */
}
.big {
    flex-grow: 3;
}

http://codepen.io/anon/pen/JEcBa

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