::before,
::after{
    margin: 0;
    padding: 0;
}

html { 
    width:100%; height:100%; margin:0
}
body {
    width:100%; height:100%; margin:0; padding:0; 
}

a{
    display:block;
    text-decoration:none;
}

.container{
    max-width: auto;
    margin:0 auto;
    padding:0 0;
}

header{
    position: fixed;
    display: flex;
    top: 0;
    z-index: 1400;
    width: 100%;
    background-color: rgba(59, 117, 202, 0.8);
    backdrop-filter: blur(2rem);
    border-bottom: 3px solid;
    border-color: #fff;
    opacity: 90%;
}

.nav-list{
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 0 5px;
}
.nav-link{
    color: #fff;
    margin-right: 50px;
    transition: color .3s ease;
}
.flashcards-link{
    color: #cdcdcd;
}
.nav-link:hover{
    color: #cdcdcd;
}
.nav-strings{
    position: absolute;
    right: 30px;
    top: 40px;
    font-size: 25px;
    font-family: arial black;
}

.nav-list-mobile{
    display: none;
}
.logo{
    background-image: url("/logo-color-removebg-preview.png");
    background-size: contain;
    background-repeat: no-repeat;
    width: 120px;
    height: 120px;
    margin-top: -10px;
    margin-left: 0px;
}
.main-body{
    width: 100%;
    height: 2100px;
    background-image: url("/1000_F_301171822_UT66FQQM5MRxtqjMLxfIexAo0vFB1F5L-transformed.jpeg");
    background-repeat: no-repeat;
    background-size: cover;
    margin-top: -10px;
    padding: 40px;
    padding-top: 60px;
    box-sizing: border-box;
}
.module-area{
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: -50px;
}
.module{
    background-color: #fff;
    margin-top: 100px;
    width: 500px;
    height: 800px;
    border: 3px solid;
    margin-left: 5px;
    margin-right: 5px;
    border-radius: 15px;
    box-sizing: border-box;
    overflow: hidden;
}
.top-section{
    margin-top: 0px;
    display: flex;
    justify-content: center;
    background-color: rgba(59, 117, 202, 0.8);
    height: 200px;
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
    border-bottom: 3px solid;
}
.main-subject{
    margin-top: 40px;
    text-align: center;
    font-family: arial black;
    font-size: 40px;
    color: #fff;
}
.bottom-section{
    padding-left: 50px;
    padding-right: 50px;
    justify-content: center;
}
.button-row{
    display: flex;
    justify-content: center;
}
.button{
    margin: 20px;
}
.subject{
    width: 150px;
    height: 60px;
    font-size: 20px;
    border: 2px solid;
    border-radius: 10px;
    transition: background-color .3s ease;
}
.subject:hover{
    background-color: inherit;
    cursor: pointer;
}
.picture{
    width: 100px;
    height: 100px;
    margin-top: 50px;
    margin-right: 10px;
}
.science{
    background-image: url("/Science-Logo-Graphics-1-14-removebg-preview\ \(1\).png");
    background-size: contain;
    background-repeat: no-repeat;
}
.history{
    background-image: url("/490-4909420_vector-illustration-of-school-history-class-textbook-school-removebg-preview.png");
    background-size: contain;
    background-repeat: no-repeat;
}
.math{
    background-image: url("/a7485c3cfc976529abb42a06d577a2bd573b0b76af3acdadd4d54872d1cd301f-removebg-preview\ \(1\).png");
    background-size: contain;
    background-repeat: no-repeat;
}
.english{
    background-image: url("/collection-colored-thin-icon-of-english-language-learning-subject-book-graduated-hat-learning-and-education-concept-illustration-vector-removebg-preview\ \(1\).png");
    background-size: contain;
    background-repeat: no-repeat;
}
.language{
    background-image: url("/3898150.png");
    background-size: contain;
    background-repeat: no-repeat;
}
.other{
    background-image: url("/logo-programming-language-computer-engineering-artwork-removebg-preview\ \(1\).png");
    background-size: contain;
    background-repeat: no-repeat;
}
.heading{
    margin-top: 100px;
    justify-content: center;
    margin-bottom: -80px;
    width: 1100px;
    margin-left: auto;
    margin-right: auto;
    background-color: rgba(255, 255, 255, .4);
    padding-bottom: .5px;
}
.title{
    text-align: center;
    font-family: arial black;
    font-size: 50px;
    margin-bottom: -10px;
}
.description{
    text-align: center;
}
.contact-area{
    justify-content: center;
    align-items: center;
    margin-top: 120px;
}
.contact{
    text-align: center;
    color: #000000;
}