app.scss

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

.sequencer {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  .kick-track,
  .snare-track,
  .hihat-track {
    margin: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 70%;
    .controls {
      justify-content: space-between;
      display: flex;
      align-items: center;
      flex: 1;
      margin: 0 20px;
      .name-track {
        font-family: sans-serif;
      }
      .mute {
        background-color: gray;
        color: white;
        width: 2rem;
        height: 2rem;
        border: none;
        cursor: pointer;
        transition: all 0.5s ease;
        &.active {
          background-color: rgb(173, 173, 173);
        }
        span {
          pointer-events: none;
        }
      }
      select {
        padding: 5px;
      }
    }
  }
  .kick,
  .hihat,
  .snare {
    display: flex;
    .pad {
      width: 3rem;
      height: 3rem;
      margin: 5px;
      cursor: pointer;
      transition: all 0.5s ease;

      &.kick-pad {
        background-color: paleturquoise;
      }
      &.snare-pad {
        background-color: rgb(175, 238, 189);
      }
      &.hihat-pad {
        background-color: rgb(176, 175, 238);
      }

      &.kick-pad.active {
        background-color: rgb(80, 214, 214);
      }
      &.snare-pad.active {
        background-color: rgb(69, 212, 100);
      }
      &.hihat-pad.active {
        background-color: rgb(76, 74, 211);
      }
    }
  }

  .play {
    background-color: gray;
    color: white;
    padding: 10px 20px;
    border: none;
    margin-top: 20px;
  }
  .tempo {
    margin: 30px;
    .tempo-slider {
      padding: 10px;
      margin: 10px 0;
      width: 100%;
      position: relative;
      background-color: gray;
      cursor: pointer;
      border-radius: 10px;
    }
    p {
      font-size: 20px;
      margin: 20px;
      text-align: center;
    }
  }
}

@keyframes playTrack {
  from {
    transform: scale(1);
  }
  to {
    transform: scale(1.2);
  }
}