Center loading div on scrollable content

Is it possible to center (middle of the screen) the container of loading svg and text within a scrollable content? The content is sometimes is not scrollable. I manage to center it vertically but if the content is too long its not centered.

HTML

<div class="content">
    <div class="wrapper">
        <div class="table-overlay">
            <div class="table-overlay-container">
                <div class="">
                    <!-- loading svg and span -->
                    <svg></svg>
                    <span>Loading...</span>
                </div>
            </div>
        </div>
    </div>
</div>

CSS/SCSS

<style lang="scss" scoped>
.content {
    /* 72px - height of top navigation bar */
    min-height: calc(100vh - 72px);
    padding-bottom: 80px;
}

.wrapper {
  padding-top: 32px;
  padding-bottom: 32px;
  width: 100%;
  height: 100%;
}

.table-overlay {
    position: absolute;
    inset: 0;
    z-index: 1000;
    width: 100%;
    height: 100%;

    .table-overlay-container {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    height: 100%;
    // margin-right: 20px;
    background-color: rgba(255, 255, 255, 0.6);
  }

  & span {
    user-select: none;
  }
}
</style>  

For HTML like this:

<div class="table-overlay">
  <div class="table-overlay-container">
    ...

Use fixed position to make the overlay cover the viewport no matter what (fixed position relatives to the viewport, with specified horizontal and vertical positions):

.table-overlay {
  position: fixed;
  inset: 0;
  /* typically, set semi-transparent background and so on */
}

To center any of the element in that, you can do:

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

or

.table-overlay {
  display: grid;
  place-items: center;
}

or

.table-overlay-container {
  position: fixed; /* or absolute */
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}