.video-wrapper {
  position: relative;
  padding-bottom: 56.25%; /* 16:9 ratio */
  height: 0;
  overflow: hidden;
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}


   
.back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: none;
  font-size: 24px;
  color: #fff;
  background: #fff;
  padding: 5px 5px;
  border-radius: 15px;
  cursor: pointer;
  z-index: 1000;
}
 
.back-to-top:hover {
  background: #333;
  text-decoration: none;
}   
   

 .container {
    display: flex;
	flex-wrap: wrap;
	justify-content: center; 
}



 
.inner-div {
    height: ;
    width: 80%; max-width:1200px;
    margin: 20px;
    background-color: #fff;
    border-radius: 15px;
    padding:20px;
    text-align: left;
	
  }


 .container1 {
    display: flex;
	flex-wrap: wrap;
	justify-content: center; 
}



 
.inner-div1 {
    height: ;
    width: 80%; max-width:1200px;
    margin: 20px;
    background-color: #fff;
    border-radius: 15px;
    padding:20px;
    text-align: left;
	
  }
  
 .inner-div1:nth-child(1) { background: #ffadad; }
.inner-div1:nth-child(2) { background: #ffd6a5; }
.inner-div1:nth-child(3) { background: #fdffb6; }
.inner-div1:nth-child(4) { background: #caffbf; }
.inner-div1:nth-child(5) { background: #9bf6ff; } 
.inner-div1:nth-child(6) { background: #7dffb6; }
.inner-div1:nth-child(7) { background: #c2ffbf; }
.inner-div1:nth-child(8) { background: #5bf6ff; } 
  
  
  .container2 {
    display: flex;
	flex-wrap: wrap;
	justify-content: center; 
}




 
.inner-div2 {
    height: ;
    width: 60%;
    margin: 5px;
    background-color: #fff;
	border-radius: 15px;
	font-size: 18px;;
	
  }
  

details {
  overflow: hidden;
  padding:5px;
  text-align: left;
  cursor:pointer;
}

summary {
  padding: 5px;
 background-color: #eeeeee;
 border-radius: 15px;
  user-select: none;
}