main{
    margin: 0 auto;
}
#top_img{
    width: 100%;
    height: auto;
}
section{
    margin: 20vw 0;
    padding: 1vw;
}
#section_1{
    height: auto;
    padding-bottom: 10vw;
    background: linear-gradient(90deg,transparent 5%,#f0f0f0 5%,#f0f0f0 65%,transparent 65%);
}
#section_2{
    height: auto;
    padding-bottom: 10vw;
    background: linear-gradient(90deg,transparent 40%,#f0f0f0 40%,#f0f0f0 95%,transparent 95%);
}
#section_3{
    height: auto;
    padding-bottom: 10vw;
    background:
    linear-gradient(90deg,transparent 20%,#f0f0f0 20%,#f0f0f0 40%,transparent 40%),
    linear-gradient(180deg,transparent 75%,#f0f0f0 75%,#f0f0f0 90%,transparent 90%);
}
p{
    width: 45vw;
    margin: 5vw 10vw;
    padding: 2vw 0;
    border-bottom: 3px solid #3e2723;
    font-size: 5vw;
    text-align: center;
}
iframe{
    display: block;
    width: 80vw;
    height: 45vw;
    margin: 0 auto;
}
article{
    width: 80vw;
    margin: 0 auto;
    font-size: 4vw;
}
.link{
    color: #03a9f4;
}
@media screen and (min-width: 1023px){
main{
    width: 1200px;
    margin: 0 auto;
    padding-top: 160px;
}
#top_img{
    width: 100%;
    height: auto;
    margin: 0 auto;
}
section{
    margin: 100px 0;
    padding: 10px;
}
#section_1{
    height: auto;
    padding-bottom: 100px;
    background: linear-gradient(90deg,transparent 5%,#f0f0f0 5%,#f0f0f0 45%,transparent 45%);
}
#section_2{
    height: auto;
    padding-bottom: 100px;
    background: linear-gradient(90deg,transparent 40%,#f0f0f0 40%,#f0f0f0 95%,transparent 95%);
}
#section_3{
    height: auto;
    padding-bottom: 100px;
    background:
    linear-gradient(90deg,transparent 20%,#f0f0f0 20%,#f0f0f0 40%,transparent 40%),
    linear-gradient(180deg,transparent 75%,#f0f0f0 75%,#f0f0f0 90%,transparent 90%);
}
p{
    width: 450px;
    margin: 30px 150px;
    padding: 20px 0;
    border-bottom: 3px solid #3e2723;
    font-size: 50px;
}
iframe{
    display: block;
    width: 900px;
    height: 500px;
    margin: 0 auto;
}
article{
    width: 100%;
    margin: 0 150px;
    font-size: 24px;
}
.link{
    color: #03a9f4;
}
}