*{
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
  }
  
  .topnav {
      background-color: rgb(45 200 45);
      overflow: hidden;
      font-family: "Ubuntu", sans-serif;
      font-weight: bold;
    }
    
    .topnav a {
      float: left;
      display: block;
      color: #f2f2f2;
      text-align: center;
      padding: 14px 16px;
      text-decoration: none;
      font-size: 17px;
    }
    
    .topnav a:hover {
      background-color: #d2e4d4;
      color: black;
    }
    
    .topnav a.active {
      background-color: #0e6344;
      color: white;
    }
    
    .topnav .icon {
      display: none;
    }
    
    .topnav input[type="text"] {
      float: right;
      padding: 6px;
      border: none;
      margin-top: 8px;
      margin-right: 16px;
      font-size: 17px;
      border-radius: 11px;
    }
  
    @media screen and (max-width: 600px) {
      .topnav a:not(:first-child) {
        display: none;
      }
      .topnav a.icon {
        float: right;
        display: block;
      }
      .topnav input {
        display: none;
      }
    }
    
    @media screen and (max-width: 600px) {
      .topnav.responsive {
        position: relative;
      }
      .topnav.responsive a.icon {
        position: absolute;
        right: 0;
        top: 0;
      }
      .topnav.responsive a {
        float: none;
        display: block;
        text-align: left;
      }
    
      .topnav.responsive input {
        float: none;
        display: block;
        text-align: left;
        width: 100%;
        margin: 0;
        padding: 14px;
        border: 2px solid black;
      }
    }

    #heading{
        font-size: 3rem;
        margin-left: 3rem;
        padding-top: 3rem;
        font-weight: bold;
        font-family: 'Roboto Condensed', sans-serif;
      }

      .main{
        /* border: 2px solid red; */
        width: 60%;
        height: auto;
        font-size: 26px;
        font-family: 'Roboto Condensed', sans-serif;
        margin-left: 45px;
        margin-top: 28px;
        background-color: #EDEDED;
        padding: 23px;
    }

    .para1{
        margin: 21px;
    }
    .head{
        margin-left: 23px;
    }

    .algo{
      border: 2px solid black;
      border-radius: 5px; 
      margin-left: 23px;
      margin-top: 2rem;
      margin-bottom: 2rem;
      font-size: 20px;
      padding-left: 2rem;
      padding-top: 0.7rem;
      padding-bottom: 0.7rem;
      }

      .footer_div {
        max-width: 1170px;
        margin: auto;
        font-family: "Ubuntu", sans-serif;
      }
      .footer_row {
        display: flex;
        flex-wrap: wrap;
      }
      ul {
        list-style: none;
      }
      .footer {
        background-color: #3b590e;
        padding: 70px 0;
      }
      .footer_col {
        width: 25%;
        padding: 0 15px;
      }
      .footer_col h4 {
        font-size: 18px;
        color: #ffffff;
        text-transform: capitalize;
        margin-bottom: 35px;
        font-weight: 500;
        position: relative;
      }
      .footer_col h4::before {
        content: "";
        position: absolute;
        left: 0;
        bottom: -10px;
        background-color: #e91e63;
        height: 2px;
        box-sizing: border-box;
        width: 50px;
      }
      .footer_col ul li:not(:last-child) {
        margin-bottom: 10px;
      }
      .footer_col ul li a {
        font-size: 16px;
        text-transform: capitalize;
        color: #ffffff;
        text-decoration: none;
        font-weight: 300;
        color: #bbbbbb;
        display: block;
        transition: all 0.3s ease;
      }
      .footer_col ul li a:hover {
        color: #ffffff;
        padding-left: 8px;
      }
      .footer_col .social-links a {
        display: inline-block;
        height: 40px;
        width: 40px;
        background-color: rgba(255, 255, 255, 0.2);
        margin: 0 10px 10px 0;
        text-align: center;
        line-height: 40px;
        border-radius: 50%;
        color: #ffffff;
        transition: all 0.5s ease;
      }
      .footer_col .social-links a:hover {
        color: #24262b;
        background-color: #ffffff;
      }
      
      /* responsive css */
      
      @media (max-width: 767px) {
        .footer_col {
          width: 50%;
          margin-bottom: 30px;
        }
      }
      @media (max-width: 574px) {
        .footer_col {
          width: 100%;
        }
      }
      #scrollTopBtn {
        background-color: rgba(64, 64, 64, 0.9);
        color: #fff;
        padding: 10px 10px;
        position: fixed;
        width: 40px;
        height: 40px;
        display: none;
        bottom: 0;
        margin-bottom: 0px;
        cursor: pointer;
        right: calc(50% - 20px);
        z-index: 1023;
      }

      @media (min-width: 400px ) and (max-width: 580px)  {
        .main {
          font-size: 20px;
          padding: 6px;
        }
      }
    
      @media (max-width: 400px) {
        .main {
          font-size: 15px;
          padding: 6px;
        }
      }
    
      @media (min-width: 400px ) and (max-width: 580px)  {
        .algo {
          font-size: 15px;
          padding-left: 1rem;
          margin-left: 15px;
          padding-right: 5px;
        }
      }
    
      @media (max-width: 400px) {
        .algo {
          font-size: 12px;
          padding-left: 1rem;
          margin-left: 15px;
          padding-right: 5px;
        }
      }
    
      @media (max-width: 400px) {
        #heading {
          font-size: 2rem;
        }
      }