move image to center in popup modal

I am using a Popup modal component from the reactjs-popup library. I want to place the charts image (three charts in 1 image) at the center of the popup but properties like align-self dont seem to work for me. What else can I try?

export default () => (
    trigger={<button className="button"> Guide </button>}
    {(close: any) => (
      <div className="modal">
        <button className="close" onClick={close}>
        <div className="header"> Guide </div>
        <div className="content">
          {' '}
          {/* <img src={chart} alt="charts" className="charts"/> */}
          <img src={img} alt="charts" className="charts" />
          What is overfitting?
          <br />
          What is underfitting?
          This example demonstrates the problems of underfitting and overfitting and how we can use linear regression with polynomial features to approximate nonlinear functions.
        <div className="actions">

This is how it looks like: enter image description here


.modal {
    font-size: 12px;
    border-color: black;
    border-style: solid;
  .modal > .content {
    width: 100%;
    padding: 10px 5px;
    background-color: white;
  .modal > .actions {
    width: 100%;
    padding: 10px 5px;
    margin: auto;
    text-align: center;
    background-color: white;
  .charts {
    align-self: center;

I also want to move the text what's overfitting under the images in center.


Add display: flex; to the css class of .modal > content. Furthermore, to align the items in the center, you need to set flex-direction: column; and align-items: center in the same css class.

I also recommend you read up on the concept of flex alignment in this MDN article.

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