sample.css

body{
    margin: 0;
    padding:0;
    height: 100vh;
}
#particles-js
{
    height: 100%;
    background:rgb(38, 114, 114);
}
.container {
    height: 100%;
    width: 100%;
  }
  .topnav {
    background-color: #333;
    overflow: hidden;
  }
  
  .topnav a {
    float: left;
    display: block;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 20px;
    font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;
  }
  .topnav a:hover, .dropdown:hover .dropbtn {
    background-color: #555;
    color: white;
  }
  
  a:focus {
    background-color: rgb(38, 114, 114);
  }  
  .fleft{
      float: left;
      width: 25%;
  }
  .fleft1{
    float: left;
    width: 49%;
    text-align: right;
    text-justify: auto;
}
.fright{
    float: right;
    width: 49%;
   text-align: left;
}
/********************************css nw **************************************/
.cancelbtn {
    width: auto;
    padding: 10px 18px;
    background-color: #f44336;
  }
  
  /* Center the image and position the close button */
  .imgcontainer {
    text-align: left;
    margin: 25px 18px ;
    position: relative;
  }  
  img.avatar {
    width: 25%;
    border-radius: 20%;
  }
  
  .container1 {
    padding: 20px;
  }
  
  span.psw {
    float: right;
    padding-top: 16px;
  }
  
  /* The Modal (background) */
  .modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
    padding-top: 100px;
  }
  
  /* Modal Content/Box */
  .modal-content {
    background-color: #fefefe;
    margin: 5% auto 15% auto; /* 5% from the top, 15% from the bottom and centered */
    border: 1px solid #888;
    width: 50%; /* Could be more or less, depending on screen size */
  }
  
  /* The Close Button (x) */
  .close {
    position: absolute;
    right: 25px;
    top: 0;
    color: #000;
    font-size: 35px;
    font-weight: bold;
  }
  
  .close:hover,
  .close:focus {
    color: red;
    cursor: pointer;
  }
  
  /* Add Zoom Animation */
  .animate {
    -webkit-animation: animatezoom 0.6s;
    animation: animatezoom 0.6s
  }
  
  @-webkit-keyframes animatezoom {
    from {-webkit-transform: scale(0)} 
    to {-webkit-transform: scale(1)}
  }
    
  @keyframes animatezoom {
    from {transform: scale(0)} 
    to {transform: scale(1)}
  }
  
  /* Change styles for span and cancel button on extra small screens */
  @media screen and (max-width: 300px) {
    span.psw {
       display: block;
       float: none;
    }
    .cancelbtn {
       width: 100%;
    }
  }
  /**********************************END*******************************/
  td{
    text-align: right;
  }