@charset "UTF-8";
html {
width: 100%;
}
body {
width: 100%;
text-align: center;
}
body div {
width: 100%;
display: block;
margin-left: auto;
margin-right: auto;
}
body div picture {
width: 100%;
}
picture img {
width: 100%;
height: auto;
}

@media screen and (min-width: 640px) {
picture img {
width: 90%;
max-width: 1080px;
}
a img:hover{
opacity: 0.6;
}
}