* {
    margin: 0;
    padding: 0;
}

body {
    font-family: "Helvetica Neue",
      Arial,
      "Hiragino Kaku Gothic ProN",
      "Hiragino Sans",
      Meiryo,
      sans-serif;
  }

header {
    position: fixed;
    top: 0;
    width: 100%;
    height: 50px;
    background-color: #000000;
    z-index: 10;
}

main {
    margin: 60px auto;
    text-align: center;
    z-index: 1;
}

@media screen and (max-width: 950px){
#nav {
    position: absolute;
    top: 0;
    right: -60%;
    width: 60%;
    height: 100vh;
    background: #ffffff;
    transition: .7s;
    z-index: 10;
    opacity: 0.9;
}
#nav ul {
    padding-top: 40px;
}

#nav ul li{
    list-style-type: none;
    font-size: 20px;
}
#nav a{
    display: block;
    text-decoration: none;
    color: #000000;
    margin: 0 15px;
    padding: 10px;
    transition: .5s;
}
#nav li a:hover {
    color: #ffffff;
    background: #cd5c5c;
    border-bottom: none;
}

#hamburger {
    display: block;
    position: absolute;
    top: 10px;
    right: 30px;
    width: 30px;
    height: 30px;
    cursor: pointer;
    transition: 1s;
    z-index: 100;
}

.inner_line {
    display: block;
    position: absolute;
    left: 0;
    width: 30px;
    height: 3px;
    background-color: #ffffff;
    border-radius: 4px;
    transition: 1s;
}
#line1 {
    top: 0;
}
#line2 {
    top: 13px;
}
#line3 {
    bottom: 0px;
}

.in {
    transform: translateX(-100%);
}

.line_1,.line_2,.line_3 {
    background: #000000;
}

.line_1 {
    transform: translateY(13px) rotate(-405deg);
    top: 0;
}
.line_2 {
    opacity: 0;
}
.line_3 {
    transform: translateY(-13px) rotate(405deg);
    bottom: 0;
}

.cover_on {
    position: fixed;
    top: 0;
    width: 100%;
    height: 100%;
    background: black;
    opacity: 0.6;
    z-index: 9;
    transition: 1s;
}
}
@media screen and (min-width: 950px) {
#hamburger {
    display: none;
}
#cover {
    display: none;
}
#nav ul {
    display: flex;
    flex-direction: row;
    justify-content: center;
}
#nav ul li{
    list-style-type: none;
    font-size: 20px;
}
#nav a{
    display: block;
    text-decoration: none;
    color: white;
    margin: 0 15px;
    padding: 10px;
    transition: .5s;
}
}
.getDayDiff-btn {
    width: 100px;
    height: 30px;
    margin-top: 30px;
}