div.at-container {
    display: flex;
  
  }
  
  #header {
    color: #4f2037;
    font-weight: bold;
    font-size: 3vw;
    justify-content: center;
    text-decoration-color: #4f2037;
    position: relative;
    align-items: center;
    margin-left: 25%;
    padding-top: 2%;
  }
  
  
  
  
  /* chamber img */
  img.centered {
    max-width: 70%;
    height: auto;
    display: block;
    margin: 0 auto;
  
  }
  
  
  
  /* waste water */
  .color-overlay {
    position: absolute;
    top: 26.5%;
    left: 27.3%;
    width: 16.7%;
    height: 45%;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0.5;
    z-index: 1;
    background-color: rgb(73, 65, 31);
    
  }
  
  /* catholyte pottassium permaganate */
  .color-overlay1 {
    position: absolute;
    top: 26.5%;
    left: 44%;
    width: 18.5%;
    height: 45%;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color:#660066;
    opacity: 0.5;
    z-index: 1;
    display: none;
  }
  
  /*water catholyte*/
  .color-overlay3 {
    position: absolute;
    top: 26.5%;
    left: 44%;
    width: 18.5%;
    height: 45%;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #DEF4FC;
    opacity: 0.6;
    z-index: 1;
    display: none;
  }
  
  /* agar */
  .color-overlay2 {
    position: absolute;
    top: 6%;
    left: 44%;
    width: 2.3%;
    height: 65.6%;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    background-color: #c5b46e;
    opacity: 0.5;
    z-index: 1;
  }
  
  
  /* overlay1 and two text */
  .overlay-text1 {
  
    font-size: 1.5vw;
    font-weight: bold;
    margin: 0 auto;
    padding: 10px;
    width: 80%;
    text-align: center;
    position: absolute;
    top: -30%;
    left: 50%;
    transform: translate(-50%, -50%);
  
  }
  
  
  .overlay-text2 {
    font-size: 1.5vw;
    font-weight: bold;
    margin: 0 auto;
    padding: 10px;
    width: 80%;
    text-align: center;
    position: absolute;
    top: -30%;
    left: 50%;
    transform: translate(-50%, -50%);
  }
  
  
  
  
  .chamber_anodename {
    text-align: center;
    margin-left: -530px;
    margin-top: -20px;
    opacity: 0.9;
    font-size: 20px;
    font-weight: bold;
  }
  
  .chamber_cathodename {
    text-align: center;
    margin-left: 500px;
    margin-top: -20px;
    opacity: 0.9;
    font-size: 20px;
    font-weight: bold;
  }
  
  
  .commonAnode-container {
    position: absolute;
    top: 22%;
    left: 40%;
    width: 2%;
    height: 42%;
    align-items: center;
    justify-content: center;
    z-index: 1;
    opacity: 0.8
  }
  
  .commonAnode-container img {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    display: none;
  }
  
  .commonAnode-graphite {
    position: absolute;
    top: 5%;
    left: 37.6%;
    width: 7%;
    height: 70%;
    align-items: center;
    justify-content: center;
    opacity: 0.9;
  }
  
  .commonAnode-graphite img {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    display: none;
  }
  
  .commonCathode-graphite {
    position: absolute;
    top: -35%;
    left: -115%;
    width: 350%;
    height: 160%;
    align-items: center;
    justify-content: center;
    opacity:1;
  }
  
  .commonCathode-graphite img {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    display: none;
  }
  
  .commonCathode-container {
    position: absolute;
    top: 22%;
    left: 48.5%;
    width: 2%;
    height: 42%;
    align-items: center;
    justify-content: center;
    z-index: 1;
    opacity: 0.8
  }
  
  .commonCathode-container img {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    display: none;
  }
  
  
  .stand_image {
  
    position: absolute;
    display: inline;
    top: -10%;
    left: 29.4%;
    width: 75%;
    height: 80%;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1;
  
  
  }
  
  #stand-image {
    position: absolute;
    width:50.2%;
    height: 35%;
    object-fit: cover;
    top:-4.5%;
    left:-4.5%;
  
  }
  
  /*BULB css*/
  .bulb_image {
    top: -10%;
    left: 4.6%;
    align-items: center;
    justify-content: center;
    text-align: center;
  
  }
  
  #bulbOff-image {
    top: 0;
    width: 5%;
    height: 25%;
    left: 42.2%;
    top: -25.7%;
    filter: grayscale(100%);
    position: absolute;
  
  }
  
  
  #bulbOn-image {
    width: 5%;
    height: 25%;
    left: 42.2%;
    top: -25.7%;
    position: absolute;
    filter: brightness(180%); 
  }
  
  
  .wire_image {
    position: absolute;
    top: -2.9%;
    left: 36.7%;
    width: 10%;
    height: 30%;
    align-items: center;
    justify-content: center;
    opacity: 0.9;
  
  }
  
  #wire-image {
    position: absolute;
    width: 100%;
    height: 100%;
  
  }
  
  .wire2_image {
    position: absolute;
    top: -2.9%;
    left: 38.5%;
    width: 20%;
    height: 30%;
    align-items: center;
    justify-content: center;
  
  
  }
  
  
  #wire2-image {
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    position: absolute;
  
  }
  
  /* Menu Alignment*/
  .main-container {
    position: absolute;
    top: 20%;
    left: 1%;
    width: 80%;
    height: 20%;
  
  }
  
  
  label {
    display: inline-block;
    padding: 0.6em;
    border: 1px solid #ccc;
    text-align: left;
    background-color: #f7f0f0;
    font-weight: bold;
    width: 20%;
    font-size: 1.5vw;
  }
  
  
  .custom-select {
    width: 30%;
    padding: 0.6em;
    border: 1px solid #ccc;
    box-sizing: border-box;
    font-size: 1.5vw;
    font-weight: bold;
    background-color: rgb(228, 109, 155);
  }
  
  
  .image-container {
    position: absolute;
    display: inline-block;
    top: 55%;
    
  }
  
  .custom-select option:checked {
    background-color: #ddd;
  }
  .myChart_id {
    position: absolute;
    display: flex;
    max-width: 35%;
    margin-left: 42%; 
    top: 18%; 
    width: 100%;
  }
  
  @media (max-width: 768px) {
     #header {
      font-size: 5vw;
    }
     label {
      width: 20%;
      font-size: 1.8vw;
      top:20%;
    }
  
    .custom-select {
      width: 40%;
      font-size: 1.8vw;
    }
    .image-container {
      position: absolute;
      display: inline-block;
      top: 40%;
     
    }
    .main-container {
    position: absolute;
    top: 20%;
    left: 1%;
    width: 80%;
    height: 25%;
  
  }
  .myChart_id {
   flex-direction:column;
    max-width: 80%;
    height:40%;
    margin-left: 10%; 
    top: 50%; 
  }
  }
  
  
  
   @media (min-width: 1024px) {
        #header {
      font-size: 2vw;
    }
     label {
      width: 15%;
      font-size: 1vw;
      top:20%;
    }
  
    .custom-select {
      width: 24%;
      font-size: 1vw;
    }
    .image-container {
      position: absolute;
      display: inline-block;
      top: 55%;
      left:20%;
    }
    .main-container {
    position: absolute;
    top: 20%;
    left: 1%;
    width: 80%;
    height: 22%;
  
  }
  .myChart_id {
   display:flex;
    max-width: 30%;
    height:40%;
    margin-left: 35%; 
    top: 10%; 
  }
    
   }