style.css

* {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    box-sizing: border-box;
}

body {
    background-color: #000;
    color: #fff;
}

.header {
    width: 100%;
    height: 100vh;
    background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url(images/header-image.png);
    background-size: cover;
    background-position: center;
    padding: 10px 8%;
    position: relative;
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
}

.logo {
    width: 150px;
    cursor: pointer;
}

nav button {
    border: 0;
    outline: 0;
    background: #db0001;
    color: #fff;
    padding: 7px 20px;
    font-size: 12px;
    border-radius: 4px;
    margin-left: 10px;
    cursor: pointer;
}

.language-btn {
    display: inline-flex;
    align-items: center;
    background: transparent;
    border: 1px solid #fff;
    padding: 7px 10px;
}

.language-btn img {
    width: 10px;
    margin-left: 10px;
}

.header-contain {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    margin-top: 100px;
}

.header-contain h1 {
    font-size: 60px;
    line-height: 65px;
    font-weight: 600;
    max-width: 650px;
}

.header-contain h3 {
    font-weight: 400;
    margin-bottom: 15px;
}

.header-contain p {
    font-weight: 400;
    font-size: 19px;
    margin-bottom: 12px;
}

.email-signup{
    background: #fff;
    border-radius: 4px;
    display: flex;
    align-items: center;
    margin-top: 30px;
    overflow: hidden;
}
.email-signup input {
    flex: 1;
    border: 0;
    outline: 0;
    margin-left: 20px;
}

.email-signup button {
    background: #db0001;
    border: 0;
    outline: 0;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    padding: 15px 30px;
}

/* features-section */
.features {
    padding: 50px 12%;
    font-size: 22px;
}

.row {
    display: inline-flex;
    width: 100%;
    align-items: center;
    flex-wrap: wrap;
    padding: 50px 0;
}

.text-col {
    flex-basis: 50%;
    margin-bottom: 20px;
}
.text-col p{
    font-weight: 100;
}

.img-col {
    flex-basis: 50%;
    margin-bottom: 20px;
}

.img-col img {
    display: block;
    width: 90%;
    margin: auto;
}
.features h2{
    font-size: 50px;
    font-weight: 550;
    margin-bottom: 20px;
}

/* faq */
.faq{
    padding: 50px 12%;
    text-align: center;
    font-size: 18px;
}
.faq h2{
    font-weight: 500;
    font-size: 40px;
}
.accordion{
    margin: 60px auto;
    width: 100%;
    max-width: 750px;
}
.accordion li{
    list-style: none;
    width: 100%;
    padding: 5px;
}
.accordion li label{
    display: flex;
    align-items: center;
    padding: 20px;
    font-size: 18px;
    font-weight: 500;
    background: #303030;
    margin-bottom: 2px;
    cursor: pointer;
    position: relative;
}
label::after{
    content: '+';
    font: 34px;
    position: absolute;
    right: 20px;
    transition: transform 0.5s ;
}
input[type="radio"]{
    display: none;
}

.accordion .content{
    background: #303030;
    text-align: left;
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s, padding 0.5s;
}

.accordion input[type="radio"]:checked + label + .content{
    max-height: 600px;
    padding: 30px 20px;
}
.accordion input[type="radio"]:checked + label::after{
    transform: rotate(135deg);
}

.faq.email-signup{
    max-width: 600px;
    margin: 20px auto 60px;
}
.faq small{
    font-size: 19px;
}
/* -----------foooter------------ */
.footer{
    padding: 50px 15% 10px;
    border-top: 4.5px solid #333;
    color: #777;
}
.footer h2{
    font-size: 18px;
    font-weight: 400;
    margin-bottom: 30px;
}
.footer .col{
    flex-basis: 25%;
    flex-grow: 1;
    margin-bottom: 20px;
}

.footer .col a{
    display: block;
    text-decoration: none;
    color: #777;
    font-size: 14px;
    margin-bottom: 10px;
}

.footer .row{
    align-items: flex-start;
    padding: 10px 0;
}
.footer .language-btn{
    color: #fff;
    padding: 10px 20px;
    border-radius: 3px;
}
.copyright-text{
    font-size: 14px;
    margin-top: 20px;
    margin-bottom: 10px;
}

/* --------media queries---------- */

@media screen and (max-width: 600px){
    .logo{
        width: 100px;
    }
    nav button{
        padding: 5px 10px;
    }
    nav .language-btn{
        padding: 4px 8px;
    }
    .header-contain{
        position: unset;
        transform: none;
        padding-top: 80px;
    }
    .header-contain h1{
        font-size: 30px;
    }
    .email-signup button{
        font-size: 12px;
        padding: 10px 15px;
    }
    .text-col, .img-col{
        flex-basis: 100%;
    }
    .features h2{
        font-size: 30px;
    }
    .features p{
        font-size: 18px;
    }
    .row:nth-child(2), .row:nth-child(4){
        flex-direction: column-reverse;
    }
    .features .row{
        padding: 10px 0;
    }
    .faq h2{
        font-size: 20px;
    }
    .accordion .content{
        font-size: 14px;
    }
    .accordion li label{
        padding: 10px;
        font-size: 14px;
    }
    label::after{
        font-size: 22px;
    }
}