body {
    background-image: url("../img/background.jpg");
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: cover;
    overflow: auto;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

#h1 {
    margin-left: 5%;
    margin-top: 2%;
    color: rgba(255, 255, 255, 0.788);
    font-size: 3em;
}

img {
    max-width: 100%
}

h2 {
    color: rgba(255, 255, 255, 0.788);
    margin-top: 3%;
    margin-left: 5%;
    font-size: 2em;
}

h3 {
    color: rgba(255, 255, 255, 0.788);
    margin-top: 8%;
    margin-bottom: 5%;
    font-size: 2.3em;
    text-align: center;
}

table {
    margin-top: 3%;
    margin-left: 10%;
    width: 80%;
    color: rgba(255, 255, 255, 0.788);
    text-align: center;
}

th {
    background-color: #c25106;
    font-size: 1.1em;
}

td {
    background-color: #333;
    font-size: 1em;
}

#last_table {
    margin-bottom: 5%;
}

.topnav {
    background-color: #333;
    width: 50%;
    margin-left: 3%;
    display: flex;
}

.topnav a {
    float: left;
    color: #f2f2f2;
    text-align: center;
    text-decoration: none;
    font-size: 1.5em;
    padding-left: 3%;
    flex-basis: 50%;
}

.topnav a:hover {
    background-color: #c2510679;
    color: black;
}

.topnav a.active {
    background-color: #c25106;
    color: white;
}

.first {
    margin-top: 5%;
    display: flex;
    width: 90%;
}

.second {
    margin-top: 5%;
    display: flex;
    width: 90%;
}

.third {
    margin-top: 5%;
    display: flex;
    width: 90%;
}

#kongdong1 {
    flex-basis: 50%;
    padding-left: 5%;
}

#kongdong2 {
    flex-basis: 40%;
    padding-left: 0%;
}

#kongdong3 {
    flex-basis: 30%;
    padding-left: 5%;
}

#describtion {
    font-size: 1.5em;
    text-align: center;
    padding-left: 15%;
    padding-right: 5%;
    padding-top: 5%;
    color: rgba(255, 255, 255, 0.788);
    vertical-align: middle;
}

#second_text {
    font-size: 1.5em;
    text-align: center;
    padding-left: 8%;
    padding-top: 0%;
    padding-right: 15%;
    color: rgba(255, 255, 255, 0.788);
    margin-right: 3%;
    float: left;
    width: 40%;
    vertical-align: middle;
}

#links {
    font-size: 1.5em;
    text-align: center;
    padding-left: 15%;
    padding-right: 5%;
    padding-top: 5%;
    color: rgba(255, 255, 255, 0.788);
    vertical-align: middle;
}