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;

    }

}

.question {
    font-weight: 600;
}

.answers {
    margin-bottom: 20px;
}

#submit {
    font-family: sans-serif;
    font-size: 20px;
    background-color: #297;
    color: #fff;
    border: 0px;
    border-radius: 3px;
    padding: 20px;
    cursor: pointer;
    margin-bottom: 20px;
}

#submit:hover {
    background-color: #3a8;
}

form ul {
    list-style-type: none;
}

.quiz-container {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 0 10px 2px rgba(100, 100, 100, 0.1);
    width: 600px;
    overflow: hidden;
}

.quiz-header {
    padding: 4rem;

}



button {
    background-color: #03cae4;
    color: #fff;
    border: none;
    display: block;
    width: 100%;
    cursor: pointer;
    font-size: 1.1rem;
    font-family: inherit;
    padding: 1.3rem;
}

button:hover {
    background-color: #04adc4;
}

button:focus {
    outline: none;
    background-color: #44b927;
}

form {
    margin: auto;
}