*{
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    box-sizing: border-box;
    

   }
   body{
    background-color: bisque;
   }
   .container{
    width: 100%;
    height: 100vh;
    background-image: url("gauss_blur.jpg") ;
    background-position: center;
    background-size: cover;
    padding-left: 8%;
    padding-right: 8%;
    box-sizing: border-box;
   }
.navbar{
    height: 12%;
    display: flex;
    align-items: center;
}
.menu-icon{
    width: 30px;
    cursor: pointer;
    margin: 40px;
}
nav{
    flex: 1;
    text-align: right;

}
nav ul li{
    list-style: none;
    display: inline-block;
    margin-left: 60px;

}
nav ul li a{
    text-decoration: none;
    color: #fff;
    font-size: 13px;
}
.row{
    display: flex;
    height: 88%;
    align-items: center;
}
.col{
    flex-basis: 50%;
}
h1{
    color: #fff;
    font-size: 80px;
}
p{
    color: beige;
    font-size: 15px;
    line-height: 25px;
   
    text-align: center;

}
h2{
    text-align: center;
    font-size: 20px;
    color: beige;
}
.text{
    width: 300px;
    margin-left: 35px;
    margin-top: 15px;
    
}
#about-section {
  background-image: url("original.jpg");
  background-size: 100%; 
  align-items: center;
  padding-top: 50px;
}
.about{
  text-align: center;
  text-shadow: 4px 4px #ff0000;
  font-size: 100px;
  margin-left: 40px;
}
#about-message {
  text-align: center;
  margin-top: 60px;
  margin-bottom: 10px;
  height: 170px;
  font-size: 18px;
  font-weight:bolder;
  background-color: rgba(119, 221, 119, 0.5);
  border-radius: 10px;
  padding-top: 20px;
  text-shadow: 1px 1px #ff0000;
  color:rgb(251, 218, 218);

}
#about-warning {
  font-size: 20px;
  font-weight: bold;
  background-color: rgba(119, 221, 119, 0.5);
  border-radius: 10px;
  height: 100px;
  padding-top: 25px;
  text-shadow: 1px 1px #ff0000;
  color:rgb(251, 218, 218);
  
}
/*gumb za povratak na početak*/
#myBtn {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 30px;
    z-index: 99;
    font-size: 15px;
    border: none;
    outline: none;
    background-color: grey;
    color: white;
    cursor: pointer;
    padding: 15px;
    border-radius: 4px;
  }
  
  #myBtn:hover {
    background-color: #555;
  }

/*kartice*/

.flip-card {
    margin-left: 300px;
    margin-top: 100px;
    background-color: transparent;
    width: 400px;
    height: 600px;
    perspective: 1000px;
    
    
  }
  
  .flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 1s;
    transform-style: preserve-3d;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
    
  }
  
  .flip-card:hover .flip-card-inner {
    transform: rotateY(180deg);
    border-radius: 10%;
    
  }
  
  .flip-card-front, .flip-card-back {
    position:absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: 10%;
  }
  
  .flip-card-front {
    background-color: #bbb;
    color: black;
  }
  
  .flip-card-back {
    
    color: black;
    transform: rotateY(180deg);
  }
  .zrak{
    background-image: url("air.jpg");
  }
  .ocean{
    background-image: url("plass.jpg");
    background-repeat: no-repeat;
    background-size: cover;
    
  }
  #ocean{
    margin-top: -700px;
    margin-left: 200px;

  }

  input[type=text], select, textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    resize: vertical;
  }
  
  label {
    padding: 12px 12px 12px 0;
    display: inline-block;
  }
  
  input[type=submit] {
    background-color: #04AA6D;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    float: right;
  }
  
  input[type=submit]:hover {
    background-color: #45a049;
  }
  
  .container2 {
    border-radius: 5px;
    background-color: #BEE5B0;
    padding: 20px;
    width: 500px;
    height: 300px;
    margin-top: 60px;
  }
  
  .col-25 {
    float: left;
    width: 25%;
    margin-top: 6px;
  }
  
  .col-75 {
    float: left;
    width: 75%;
    margin-top: 6px;
  }
  @media screen and (max-width: 500px) {
    .col-25, .col-75, input[type=submit] {
      width: 100%;
      margin-top: 0;
    }
  }
  /* Clear floats after the columns */
  .row:after {
    content: "";
    display: table;
    clear: both;
  }