styles.css

*{
    padding: 0;
    margin:0;
}
body{
    overflow-x: hidden;
    height: 10000px;
    background: linear-gradient( 200deg, #051722 , #354649  , #6C7A89, #A3C6C4 ,#E0E7E9    );
   
}
main{
    background-color:#F2D2BD;
    height: auto;
   
}
#icon{
    width: 200px;
    margin: 20px;
}
.header{
    width: 100%;
    position: relative;
    background: linear-gradient(to left top, #28282B, #000000		 ) 	;
    background-repeat: no-repeat;
}
nav{
    display: flex;
    justify-content: space-between;
    align-items: center;

}
.nav-links{
    flex: 1;
    text-align: right;
}
.nav-links ul{
    padding: 0 30px;
}
.nav-links ul li{
    list-style-type: none;
    display: inline-block;
    padding: 0 30px;
    position: relative;
}
.nav-links ul li a{
    text-decoration: none;
    color: #D3D3D3	 ;
    font-family: 'Anton', sans-serif;                                                                                  
    font-size: 30px;
    transition: 0.5s;
    letter-spacing: 5px;
    
}
.nav-links ul li a:after{
    content: "";
    position: absolute;
    background-color: grey;
    height: 4px;
    width: 0;
    left: 25px;
    bottom: -7px;
    transition: 0.5s;
    
}

.nav-links ul li a:hover{
    color: 	white;
  
}

.nav-links ul li a:hover::after{
    width: 80%;
    transition: 1s;

}

.btn-close{
    display: none;
    transition: 1s;
}
#menuicon{
    display: none;
    cursor: pointer;
    transition: 1s;
    width: 100px;
}

.slider {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
  }
  
  .slides {
    position: absolute;
    top: 0;
    left: 0;
    width: 300%;
    height: 100%;
    transition: 2s ease;
  }
  
  
  .slide {
    width: 33.33%;
    height: 100%;
    float: left;
    position: relative;
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
  }
  
  .slide::before {
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background-color: rgba(0,0,0,0.5);
  }
  
  .slide-data {
    width: 100%;
    position: absolute;
    top: 50%;
    color: #fff;
    text-align: center;
    transform: translateY(-50%);
    padding: 0 20%;
  }
  
  .slide-data h1 {
    font-family: "ICA Rubrik", serif;
    font-weight: bolder;
    text-transform: uppercase;
    font-size: 45px;
  }
  
  .slide-data p {
    font-family: "Lato", serif;
    font-size: 18px;
    margin-bottom: 10px;
  }
  
  .slide-data button {
    padding: 10px 25px;
    color: #fff;
    border: 1px solid #fff;
    background: transparent;
    outline: none;
    font-size: 25px;
    font-weight: bolder;
  }
  
  .slide-data button:hover {
    color: #000;
    background-color: #fff;
  }
  
  .slide-1 {
    background-image: url(20180115159.jpg);
  }
  
  .slide-2 {
    background-image: url(bomba2_121030_600.jpg);
  }
  
  .slide-3 {
    background-image: url(teller-ede-head-630x320.jpg);
  }
  
  .slider .arrows {
    display: flex;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: #fff;
    font-size: 60px;
    transition: 0.4s linear;
  }
  
  .slider .arrows:hover {
    color: #000;
    text-shadow: 0px 0px 10px #fff, 0px 0px 10px #fff;
  }
  
  .slider .arrows label {
    display: none;
  }
  
  .slider .arrow-left {
    left: 3%;
  }
  
  .slider .arrow-right {
    right: 3%;
  }
  
  .slider input:nth-child(1):checked ~ .slides {
    left: 0;
  }
  
  .slider input:nth-child(2):checked ~ .slides {
    left: -100%;
  }
  
  .slider input:nth-child(3):checked ~ .slides {
    left: -200%;
  }
  
  .slider input:nth-child(1):checked ~ .arrows label:nth-child(1),
  .slider input:nth-child(2):checked ~ .arrows label:nth-child(2),
  .slider input:nth-child(3):checked ~ .arrows label:nth-child(3) {
    display: block;
  }
  
  .slider .dots {
    width: 100%;
    text-align: center;
    position: absolute;
    bottom: 15px;
  }
  
  .slider .dots label {
    display: inline-block;
    border-radius: 100%;
    margin: 0 6px;
    width: 25px;
    height: 25px;
    background-color: #fff;
  }
  
  .slider input:nth-child(1):checked ~ .dots label:nth-child(1),
  .slider input:nth-child(2):checked ~ .dots label:nth-child(2),
  .slider input:nth-child(3):checked ~ .dots label:nth-child(3) {
    background-color: #000;
    border: 2px solid #fff;
  }

  h1{
    color: white;
    font-family: 'Anton', sans-serif;
    text-align: center;
    font-size: 70px;
  }
  h2{
    text-align: center; font-size: 50px; font-family: 'anton', sans-serif; text-shadow: grey 0 0 10px; color: white;
  }


.kartyak{
    background: url("istockphoto-936903524-612x612.jpg") ;
    height: auto;
    background-repeat: repeat;
    background-size: cover;
    background-attachment: scroll;
    background-position: center ;
    height: 1000px;
}

.kartya{
  width: 80%;
  max-width: 400px;
  padding: 5rem 2.5rem;
  border-radius: 1rem;
  border: 1px solid transparent;
  backdrop-filter: blur(1rem);
  box-shadow: 1.3rem 1.3rem 1.3rem rgba(0,0,0,0.5);
  background-color: rgba(225,225,255,0.1);
  border-top-color: rgba(230, 230, 255, 0.5) ;
  border-left-color: rgba(230,230,255,0.5) ;
  border-bottom-color: rgba(225,225,255,0.1) ;
  border-right-color: rgba(225,225,255,0.1) ;
  color: white;
  transition: 1s;
  text-shadow: 0 0 2px #D3D3D3 ;
  height: 400px;
  text-align: center;
  align-items: center;

}
.kartyak a{
    text-decoration: none;
    color: white;
}
.kartya:hover{
  box-shadow: 10px 10px 30px #D3D3D3 ;
  transition: 1s;
}

.choose{
  text-align: center;
  width: 90%;
  max-width: 400px;
  padding: 5rem 2.5rem;
  border-radius: 1rem;
  backdrop-filter: blur(1rem);
  color: white;
  transition: 1s;
  text-shadow: 0 0 2px #D3D3D3 ;
  background: linear-gradient(#899499	 ,black);
  background-repeat: no-repeat;
}
#valasz{
  background-image: url(background-khaoticfuture.gif);
  background-attachment: fixed;
  background-size: cover;
  background-repeat: no-repeat;
  background-position-x: center;
  background-position-y: center  ;
  height: 700px;
 

}
#contact{
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: center;
  padding: 20px;
  color: #D3D3D3;
}
.footer{
	background-color: #24262b;
    padding: 70px 0;

}

.szovegek{
    width: 100%;
}
.valami{
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    flex-flow: wrap;
    text-align: center;
    align-items: center;
}
.doboz{
    box-sizing: border-box;
    width: 800px;
    color: #4A0404;
}
.doboz h1{
    font-family: 'Acme', sans-serif;
    font-size: 70px;
}
.doboz p{
    font-size: 20px;
}
.doboz img{
  width: 600px;
  border-radius: 20px ;
  box-shadow: 20px 20px 50px darkslategrey;
}
@media (max-width: 1300px){
    header{
        padding: 2% 6%;
    }
    #menuicon{
        display: block;
        transition: 1s;

    }

    .navlinks ul li{
        display:block;
        transition: 1s;
    }
    .nav-links{
        position: absolute;
        background: linear-gradient( #1B1212	,#36454F		);
        height: 530px;
        width: 350px;
        top: 0;
        right: 0;
        text-align: left;
        z-index: 2;
        display: none;
        transition: 1s;
    }
    
    .btn-close{
        display: block;
        width: 200px;
        height: 200px;
        margin: 30px 0 30px 60px;
        transition: 1s;
    }
    #icon{
        width: 300px;
    }
    h1{
      font-size: 50px;
    }
    .doboz img{
      width: 400px;
      
    }
}
@media (max-width: 425px){

    #icon{
        width: 120px;
    }
    #menuicon{
        width: 50px;
    }
    .slides h1{
      font-size: 30px;
    }
    h1{
      font-size: 50px;
    }
    h2{
      font-size: 30px;
    }
    .kartya{
      max-width: 300px;
      margin: 0;
    }
    .choose{
      max-width: 300px;
      margin: 0;
    }
    .doboz img{
      width: 200px;
      
    }
    
}