Answers for "box center html css"

center a div in css

.container {
  display: flex;
  justify-content: center;
  align-items: center;
}

center a div

.container{
	margin: 0 auto;
    display: flex;
    align-items: center;
}

css center div

.my-div{
  width: 80%;
  margin: 10px auto;
  /*
    margin-left and right right has 'auto' value
    meaning that the browser will automatically calculate the remaining space
    and give it to the margin.
    From the example. 20% remained from 80%
    so that our div will have 
    margin-right: 10%
    margin-left: 10%
    and it will be centered.
  */
}