/* header */
.header a {
    color: white;
}

@media screen and (min-width: 767px) {
    .header nav {
        margin-left: 12em;
    }
}

@media screen and (max-width: 767px) {
    header nav {
        margin-left: 2em;
    }
}
/* 各画面共通 */
h1 {
    margin-top: 2em;
}
h2 {
    font-size: 120%;
    margin: 2em 0;
}
p {
    margin: 2em 0;
}
.content_center {
    text-align: center;
}
.input_box {
    margin: 1.5em;
}
btn {
    margin: 2em;
}

/* footer */
.footer p{
    color: darkgray;
}