body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    /* height: 100vh; */
    margin: 0;
    background-color: #cfe0c3;
    /* background-image: url('bgimg.png'); */
    /* background-position: ; */
    /* background-size: cover;  */

    font-family: 'Poppins', sans-serif;
    color: #1f363d;
}
.heading{
    margin: 20px;
    background-color: #cfe0c3;
}
#thumbnail-container {
    position: relative;
}

#video-container {
    display: none;
    position: relative;
    top: auto;
    left: auto;


    /* //transform: translate(-50%, -50%); */
}

#play-button {
    position: absolute;
    width: 50px;
    height: 50px;
    top: 48%;
    right: 48%;
    background: #1f363d;
    border: none;
    border-radius: 50%;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
    z-index: 1000;
    transform: translate(-50%, -50%);
}

#next-button {
    display: none;
}

#next-button {
    position: absolute;
    top: 48%;
    right: 15%;
    width: 40px;
    height: 40px;
}
.box {
    position: relative;
    padding: 5px;
    border: 1px solid #ccc;
    border-radius: 10px;
  
    background-color: #70a9a1;
    box-shadow: 2px 2px #40798c;
    margin: 2px;
    overflow: hidden; 
  }
  .box::before {
    content: "Determination of adsorption";
    display: block;
    font-size: 18px;
    color: white;
    /* text-align: center; */
    padding-bottom: 5px; /* Adjust this value as needed */
    padding: 5px 10px 5px 5px;
}
.help-button {
    position: absolute;
    top: 5px; /* Adjust top position as needed */
    right: 60px; /* Adjust right position as needed */
    background-color: #e3efda;
    color: #70a9a1;
    border: none;
    padding: 7px;
    cursor: pointer;
    border-radius: 5px;
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
}
.rectangle {
    position: fixed;
    display: block;
    top: 90vh;
    left: 24vw;
    /* background: linear-gradient(to right, #40798ce3, #70a9a161); */
    background-color: #1f363de4;
    /* Faded rectangle background color */
    color: white;
    padding: 10px;
    width: 50vw;
    /* height: 20px; */
    text-align: center;
    border-radius: 5px;
    z-index: 1000;
  }

  .rectangle button {
    background-color: #cbd2d719;
    /* font-size: large; */
    font-weight: bold;
    color: white;
    padding: 7px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    /* margin-left: 2%; */
    margin: 3px;
  }
  #runsetup {
    position: absolute;
    top: 5px; /* Adjust top position as needed */
    right: 10px; /* Adjust right position as needed */
    background-color: #e3efda;
    color: #70a9a1;
    border: none;
    padding: 7px;
    cursor: pointer;
    border-radius: 5px;
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
}

.end{
    /* background-color: #9ec1a3; */
    height: 15vh;
}
.mybutton{
    font-family: 'Poppins', sans-serif;
    background-color:#407986 !important;
    border: 2px solid white;
    box-shadow: 3px 3px #1f363d;
    color: white;
    border-radius: 20px;
    font-size: 16px;
    margin: 20px 2px 0 2px ;
    transition: transform 0.3s ease;
    padding: 6px;
}
.mybutton:hover{
    color: #cfe0c3 !important;
    transform: scale(1.1);
}