Maintaining Background Consistency as Button Count Decreases

Question

Can the background remain consistent with the buttons as their number reduces from three to two to one?

I want the background to resize to fit the new width when three columns become two and then one, now it just stays fixed with three columns.

I want the background to stay with the buttons.

When the buttons go from 3 to 2 to 1, I want the background to stay attached to the buttons.

I want the background to stay behind the buttons.

Code: https://jsfiddle.net/42Lowjt7/4/

From 3 Image

To 2 Image

To 1 Image

I tried using media queries, but I am not sure if that would work in the code.

.buttonContainerA {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  max-width: 476px;
  gap: 10px;
 background: linear-gradient(45deg,
      transparent,
      transparent 7px,
      rgb(113, 121, 126) 7px,
      rgb(113, 121, 126) 7.5px,
      transparent 7.5px,
      transparent 10px),
    linear-gradient(-45deg,
      transparent,
      transparent 7px,
      rgb(113, 121, 126) 7px,
      rgb(113, 121, 126) 7.5px,
      transparent 7.5px,
      transparent 10px);
  background-size: 10px 10px;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: #121212;
  padding: 0 8px 0;
}


.outer-container {
  display: flex;
  min-height: 100vh;
  /*justify-content: center;
  flex-direction: column;*/
}


.containerB {
  /*display: flex;
    justify-content: center;
    align-content: center;
    padding: 8px 8px;
    position: fixed;
    
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    overflow: auto;*/
  /* Enable scroll if needed */
  /*display: flex;
  min-height: 100vh;
  justify-content: center;
  flex-direction: column;
  margin-top: auto;*/
  margin: auto;
}



.modal-contentA {
  /*display: flex;
  flex-wrap: wrap;
  flex-direction: column;*/
  /* added*/
  /*min-height: 100%;*/
  margin: auto;
  /*justify-content: center;
  align-content: center;*/

}


.buttonContainerA {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  max-width: 476px;
  gap: 10px;
  /*background: red;*/
 background: linear-gradient(45deg,
      transparent,
      transparent 7px,
      rgb(113, 121, 126) 7px,
      rgb(113, 121, 126) 7.5px,
      transparent 7.5px,
      transparent 10px),
    linear-gradient(-45deg,
      transparent,
      transparent 7px,
      rgb(113, 121, 126) 7px,
      rgb(113, 121, 126) 7.5px,
      transparent 7.5px,
      transparent 10px);
  background-size: 10px 10px;
}

.playButtonA {
  flex-basis: 152px;
  /* width of each button */
  margin: 0;
  /* spacing between buttons */
  cursor: pointer;

}

.btn-primaryA {
  color: #fff;
  background-color: #0d6efd;
  border-color: #0d6efd;
}

.btnA {
  display: inline-block;
  font-weight: 400;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  vertical-align: middle;
  cursor: pointer;
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
  background-color: #0d6efd;
  border: 1px solid transparent;
  box-sizing: border-box;
  padding: 6px 12px;
  font-size: 16px;
  border-radius: 4px;
  transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
  font-family: "Poppins", sans-serif;
  font-weight: 500;
  font-style: normal;
}

.btnq {
  -webkit-appearance: none;
  appearance: none;
  height: 80px;
  width: 80px;
  padding: 0;
  color: inherit;
  border: none;
  font: inherit;
  cursor: pointer;
  outline: inherit;
  margin: auto;
}

.btnA:hover {
  background-color: #0056b3;
  color: #ffffff;
}

.btnA:focus {
  color: #fff;
  background-color: #0b5ed7;
  border-color: #0a58ca;
  /*box-shadow: 0 0 0 2px rgb(255 0 0 / 100%)*/
}

.exitB {
  position: relative;
  margin: 10px auto 0;
  inset: 0 0 0 0;
  width: 47px;
  height: 47px;
  background: black;
  border-radius: 50%;
  border: 5px solid red;
  display: flex;
  align-items: center;
  justify-content: center;
  /*margin: auto;*/
  cursor: pointer;
}

.exitB::before,
.exitB::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 5px;
  background: red;
  transform: rotate(45deg);
}

.exitB::after {
  transform: rotate(-45deg);
}

<div class="outer-container ">
  <div class="containerB">
    <div class="modal-contentA">
      <div class="buttonContainerA">
        <button data-destination="#ba" class="playButtonA btn-primaryA btnA">Listening</button>
        <button data-destination="#bb" class="playButtonA btn-primaryA btnA">Live Performance</button>
        <button data-destination="#bc" class="playButtonA btn-primaryA btnA">On Loop</button>
        <button data-destination="#bd" class="playButtonA btn-primaryA btnA">Audio Visual</button>
        <button data-destination="#be" class="playButtonA btn-primaryA btnA">Lyric Video</button>
        <button data-destination="#bf" class="playButtonA btn-primaryA btnA">Music Video</button>
        <button data-destination="#bg" class="playButtonA btn-primaryA btnA">From The Vault</button>
        <button data-destination="#bh" class="playButtonA btn-primaryA btnA">Mystery Box</button>
        <button data-destination="#bi" class="playButtonA btn-primaryA btnA">Cover</button>
        <button data-destination="#bj" class="playButtonA btn-primaryA btnA">Remix</button>
        <button data-destination="#bk" class="playButtonA btn-primaryA btnA">Instrumental</button>
        <button data-destination="#bl" class="playButtonA btn-primaryA btnA">Extended Mix</button>
        <button data-destination="#bm" class="playButtonA btn-primaryA btnA">Duet</button>
        <button data-destination="#bn" class="playButtonA btn-primaryA btnA">Acoustic</button>
        <button data-destination="#bo" class="playButtonA btn-primaryA btnA">Rework</button>
      </div>
      <button class="exitB exit" type="button" title="Exit" aria-label="Close"></button>
    </div>
  </div>

</div>