homepage.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    background-color: #fff;
    color: #fff;
    font-size: 20px;
    font-weight: 300;
    text-rendering: optimizeLegibility;
    font-family: 'Lato', Arial, sans-serif;
}

.row {
    width: 80%;
    margin: 0 auto;
}

header {
    background-image: linear-gradient(rgba(0,0,0,0.9), rgba(0,0,0,0.3)), url(https://wallpaperaccess.com/full/13397.jpg);
    background-size: cover;
    background-position: center;
    height: 100vh;
    background-attachment: fixed;
}

.header_text_content {
    position: absolute;
    width: 1140px;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
}

h1 {
    font-style: italic;
    margin: 0;
    color: #fff;
    font-size: 240%;
    font-weight: 300;
    text-transform: uppercase;
    letter-spacing: 1px;
    word-spacing: 3px;
    margin-bottom: 30px;
}

.btn:link,
.btn:visited {
    display: inline-block;
    padding: 10px 30px;
    font-weight: 300;
    text-decoration: none;
    border-radius: 200px;
    transition: background-color 0.2s, color 0.2s, border 0.2s;
}

.btn:hover,
.btn:active {
    background-color: #fff;
}

.btn_quoter:link,
.btn_quoter:visited {
    border: 1px solid #fc3d21;
    color: #fff;
    font-weight: 500;
}

.btn_quoter:hover,
.btn_quoter:active {
    color: #0b3d91;
    border: 3px solid #0b3d91;        
}

.logo {
    background-color:transparent;
    float: left;
    left: 40px;
    height: 100px;
    width: auto;
    margin-top: 20px;
}

/* ნავიგაციის მენიუ */

.main_nav {
    float: right;
    list-style: none;
    margin-top: 50px;
}

.main_nav li {
    display: inline-block;
    margin-left: 30px;
}

.main_nav li a:link,
.main_nav li a:visited {
    padding: 8px 0;
    color: #fff;
    text-decoration: none;
    text-transform: uppercase;
    font-size: 90%;
    border-bottom: 2px solid transparent;
    transition: border-bottom 0.3s;
}

.main_nav li a:hover,
.main_nav li a:active {
    border-bottom: 2px solid #fc3d21;
}

section {
    padding: 80px 0;
}

/* სექციის სათაური და ქვედა ხაზი */

.first_section{
    background-image: url(https://scx1.b-cdn.net/csz/news/800/2018/studyofdista.jpg);
}

h2 {
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 180%;
    word-spacing: 2px;
    text-align: center;
    margin-bottom: 30px;
}

h2::after {
    display: block;
    height: 2px;
    background-color: #660000;
    content: " ";
    width: 100px;
    margin: 0 auto;
    margin-top: 30px;
}

.section_description_text {
    line-height: 145%;
    width: 70%;
    margin-left: 15%;
    text-align: center;
}

.box {
    position: relative;
    top: 30px;
    padding: 1px;
}

.box p {
    font-size: 90%;
    line-height: 145%;
}

h3 {
    font-weight: 300;
    font-size: 100%;
    margin-bottom: 15px;
}

.position {
    opacity: 0.8;
    transition: transform 0.5s, opacity 0.5s;
    position: relative;
    height: 275px;
    width: 180px;
    border-radius: 50%;
}

.position:hover {
    opacity: 1.1;
    transform: scale(1.15);
}

.challenges{
    background-image:linear-gradient(rgba(0,0,0,0.9), rgba(0,0,0,0.3)), url(https://physicsworld.com/wp-content/uploads/2019/03/PWMar19Skuse-frontis_HERO-1024x576.jpg);
    background-size: cover;
    background-position: center;
    height: 100vh;
    background-attachment: fixed;
    color: #fff;
    font-weight: 600;
}

.topics {
    background-image:linear-gradient(rgba(0,0,0,0.9), rgba(0,0,0,0.3)), url(https://cdn.mos.cms.futurecdn.net/H5zQ6krHznABpkdfkoUzZX-1200-80.jpg);
    background-size: cover;
    background-position: center;
    height: 100vh;
    background-attachment: fixed;
    color: #fff;
    font-weight: 600;
}

.link-to-topic {
    color: darkslateblue;
    text-decoration: none;
}