does flex need a fixed height for align-items to work code example
Example: css flex vertical align
/* Answer to: "css flex vertical align" */
.box {
display: flex;
align-items: center; /* Vertical */
justify-content: center; /* Horizontal */
}
.box div {
width: 100px;
height: 100px;
}
/*
For more information go to:
https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Flexible_Box_Layout/Aligning_Items_in_a_Flex_Container
*/