.audio-comment-container {
  button:focus {
    outline: 0;
  }

  button.play-button {
    border: none;
    background-image: none;
    background-color: transparent;
    -webkit-box-shadow: none;
    -moz-box-shadow: none;
    box-shadow: none;

    i {
      font-size: 25px;
      margin-left: -5px;
    }
  }

  display: flex;
  vertical-align: middle;
  padding: 0%;
  width: 100%;

  i {
    color: white;
  }

  p#currentTime {
    float: right;
    white-space: nowrap;
    font-size: 12px;
    transform: translateY(16%);
    padding-left: 10px;
  }

  .progress-bar-container {
    &:hover {
      cursor: pointer;
    }

    background-color: white;
    width: 100%;
    height: 8px;
    align-self: center;
    margin-bottom: 0px;
    border-radius: 0px;

    .progress {
      box-shadow: 0px;
    }
  }

  /deep/ .mat-progress-bar-fill::after {
    background-color: white;
  }

  /deep/ .mat-progress-bar-buffer {
    background: #2650c3;
  }

  /deep/
    .mat-progress-bar-primary.mat-progress-bar-fill.mat-progress-bar-element {
    pointer-events: none;
  }
  #progressContainer {
    width: 100%;
    background-color: red;
  }
}

.audio-comment-container {
  button:focus {
    outline: 0;
  }

  button.play-button {
    border: none;
    background-image: none;
    background-color: transparent;
    -webkit-box-shadow: none;
    -moz-box-shadow: none;
    box-shadow: none;

    i {
      font-size: 25px;
      margin-left: -5px;
    }
  }

  display: flex;
  vertical-align: middle;
  padding: 0%;
  width: 100%;

  i {
    color: white;
  }

  p#currentTime {
    float: right;
    white-space: nowrap;
    font-size: 12px;
    transform: translateY(16%);
    padding-left: 10px;
  }

  .progress-bar-container {
    &:hover {
      cursor: pointer;
    }

    background-color: white;
    width: 100%;
    height: 8px;
    align-self: center;
    margin-bottom: 0px;
    border-radius: 10px;

    .progress {
      box-shadow: 0px;
    }
  }

  /deep/ .mat-progress-bar-fill::after {
    background-color: white;
  }

  /deep/ .mat-progress-bar-buffer {
    background: #2650c3;
  }

  /deep/
    .mat-progress-bar-primary.mat-progress-bar-fill.mat-progress-bar-element {
    pointer-events: none;
  }
  #progressContainer {
    width: 100%;
    background-color: red;
  }
}

Add border radius to audio-progress
LOOKS: Add border radius to audio-progress
