* {
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
    color: #333;
}

#top_btn {
    position: fixed;
    right: 30px;
    bottom: 30px;
    background-color: #99f;
    padding: 10px;
    border-radius: 50px;
    padding: 15px;
    text-align: center;
}

#wrap {
    width: 1200px;
    margin: 0 auto;
}

#header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 50px;
    background-color: rgba(255, 255, 255, 0.6);
}

#gnb {
    position: absolute;
    right: 30px;
    top: 50%;
    transform: translateY(-50%);
}

#gnb li {
    float: left;
    margin: 0 20px;
}

section {
    height: 1000px;
    padding-top: 50px
}

#section1 {
    background-color: pink;
}

#section2 {
    background-color: rgba(255, 242, 0, 0.329);
}

#section3 {
    background-color: #7fbf41;
}