.container123 {
    width: 600px;
    height: 350px;
    margin: 50px auto;
    position: relative;
    overflow: hidden;
    border-radius: 2%;
  }
  .post123 {
    background-color: white;
    position: absolute;
    left: 600px;
    width: 600px;
    height: 500px;
    transition: 2s;
  }
  .post123:nth-of-type(1) {
    left: 0;
  }
  .img123 {
    width: 150%;
    height: 500px;
  }
  .img123 img {
    width: 150%;
    height: 80%;
  }
  h1 {
    height: 100px;
    overflow: hidden;
  }
  .box123 {
    width: 150px;
    margin: 20px auto;
  }
  .box123 div {
    display: inline-block;
    width: 10px;
    height: 10px;
    border: solid 2px aquamarine;
    border-radius: 50%;
  }
  
  @media screen and (max-width:1280px) {
    .container123{
      width:100%;
      height:50vh;
      margin:-200px 0;
      position:relative;
    }
    #fest{
      font-size:47px;
    }
  }

  @media screen and (max-width:912px) {
   .container123{
    margin:-90px 0;
   }
   .img123 img{
    height:100%;
   }
  }

  @media screen and (max-width:545px) {
    .container123{
      width:90%;
      height:38vh;
      margin:-100px 0;
      position:relative;
    }
  }

  @media screen and (max-width: 480px) {
    .container123{
      width:100%;
      height:45vh;
      margin:-100px 0;
      position:relative;
    }
    .img123 img{
      height:100%;
      width:50%;
    }
    #fest{
      margin: 20px  0  0 0;
      font-size:x-large;
      text-align: center;
      
    }
    #fest1{
      margin-top:-100px
    }
    
  }