body{
    background-color: black;
}
@media screen and (max-width:720px){
  .heading {
    text-align: center;
    font-size: 3rem;
    font-weight: 800;
    color: goldenrod;
  }
}

  
  @media screen and (min-width:720px){
    .heading {
      text-align: center;
      font-size: 6rem;
      font-weight: 800;
      color: goldenrod;
    }
  }
  
  .container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    margin-top: 20px; 
  }
  
  
  .row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -10px; 
  }
  
  
  .col-sm-6 .col-md-4 .col-lg-3{
    flex: 0 0 33.333333%; 
    max-width: 33.333333%; 
    padding: 0 30px;
  }
  
  
  .main {
    background-color: #f5f5f5;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 50px; 
  }
  
  
  .main2 {
    width: 100%;
    height: 300px;
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
  }
  

  .main4 {
    text-align: center;
    margin: 10px 0;
    font-weight: 600;
  }