body, html {
    height: 100%;
    margin: 0;
    font-family: "Kanit", sans-serif;
    background-color: #ffffff;
}

h4, p {
    font-size: 18px;
}

.header {
    overflow: hidden;
    background-color: black;
    width: 100%;
}

.header a {
    float: left;
    color: #fff;
    text-align: center;
    padding: 12px;
    text-decoration: none;
    font-size: 18px;
    line-height: 25px;
    border-radius: 4px;
}

.header a.logo {
    font-size: 25px;
    font-weight: bold;
    background-color: transparent;
    font-family: "Kanit", sans-serif;
}

.header a.logo:hover {
    background-color: transparent;
    color: #fff;
}

.header a:hover {
    background-color: #fff;
    color: black;
}

.header-right {
    float: right;
}

@media screen and (max-width: 500px) {
    .header a {
        float: none;
        display: block;
        text-align: left;
    }

    .header-right {
        float: none;
    }
}

.intro {
    background-image: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('background.jpg');
    height: 95%;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
    width: 100%;
}

.intro-text {
    text-align: center;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    margin: 0;
}

.intro-text h1 {
    font-weight: 500;
    font-size: 60px;
    line-height: 1.25;
    margin-bottom: -10px;
}

.intro-text h3 {
    font-weight: 400;
    font-size: 20px;
}

p {
    font-weight: 300;
}

button {
    font-family: "Kanit", sans-serif;
    border: none;
    border-radius: 20px;
    background-color: #ffffff;
    color: black;
    padding: 12px 25px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
}