html, body {
    width: 100%;
    height: 100%;
}

body {
    overflow: hidden;
}

.header {
    height: 100px;
    background-color: #fff;
    padding: 10px 20px 14px 20px;
    position: relative;
    border-bottom: 1px solid #a4a4a4;
}

.logo {
    text-align: center;
}

.logo img {
    height: 36px;
    cursor: pointer;
}

.left-date {
    position: absolute;
    bottom: 14px;
    left: 20px;
    color: #74B550;
    font-weight: bold;
    font-size: 18px;
}

.right-date {
    position: absolute;
    bottom: 14px;
    right: 20px;
    color: #74B550;
    font-weight: bold;
    font-size: 18px;
}

.menu {
    position: absolute;
    bottom: 16px;
    left: 50%;
    width: 640px;
    margin-left: -320px;
}

.menu .left {
    float: left;
}

.menu .left a {
    margin-left: 10px;
}

.menu .right {
    float: right;
}

.menu a {
    color: #55a828;
    text-decoration: none;
    outline: none;
}

.menu a:hover {
    text-decoration: none;
    outline: none;
}

.menu-mobile {
    display: none;
}

#map {
    width: 100%;
    height: calc(100% - 100px);
}

#nav-icon {
    display: none;
    position: absolute;
    left: 20px;
    top: 11px;
    width: 30px;
    height: 26px;
    -webkit-transform: rotate(0);
    -moz-transform: rotate(0);
    -o-transform: rotate(0);
    transform: rotate(0);
    -webkit-transition: .5s ease-in-out;
    -moz-transition: .5s ease-in-out;
    -o-transition: .5s ease-in-out;
    transition: .5s ease-in-out;
    cursor: pointer;
}

#nav-icon span {
    display: block;
    position: absolute;
    height: 5px;
    width: 100%;
    background: #807f7f;
    border-radius: 5px;
    opacity: 1;
    left: 0;
    -webkit-transform: rotate(0);
    -moz-transform: rotate(0);
    -o-transform: rotate(0);
    transform: rotate(0);
    -webkit-transition: .25s ease-in-out;
    -moz-transition: .25s ease-in-out;
    -o-transition: .25s ease-in-out;
    transition: .25s ease-in-out;
}

#nav-icon span:nth-child(1) {
    top: 0;
}

#nav-icon.open span:nth-child(1) {
    top: 10px;
    width: 0;
    left: 50%;
}

#nav-icon span:nth-child(2), #nav-icon span:nth-child(3) {
    top: 10px;
}

#nav-icon.open span:nth-child(2) {
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
}

#nav-icon.open span:nth-child(3) {
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
}

#nav-icon span:nth-child(4) {
    top: 20px;
}

#nav-icon.open span:nth-child(4) {
    top: 10px;
    width: 0;
    left: 50%;
}

.menu-mobile {
    display: none;
    position: absolute;
    z-index: 5000;
    width: 100%;
    height: auto;
    background: #fff;
    padding: 10px 20px;
    top: 79px;
    left: 0;
}

.menu-mobile a {
    display: block;
    padding: 6px 0;
    color: #55a828;
    text-decoration: none;
    outline: none;
}

.menu-mobile a:first-of-type {
    margin-top: 4px;
}

.menu-mobile a:hover {
    text-decoration: none;
    outline: none;
}

.menu-mobile .about {
    margin-top: 7px;
}


.menu-mobile.open {
    display: block;
}

#about-modal {
    display: none;
    color: #495057;
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 6400;
    overflow-x: hidden;
    overflow-y: auto;
}

#about-modal .content {
    position: relative;
    padding: 25px;
    width: 500px;
    background: #fff;
    margin: 100px auto;
}

.close {
    position: absolute;
    right: 14px;
    top: 12px;
    cursor: pointer;
    width: 20px;
    height: 20px;
    opacity: 1;
}

.close:before, .close:after {
    position: absolute;
    left: 10px;
    content: ' ';
    height: 20px;
    width: 2px;
    background-color: #333;
}

.close:before {
    transform: rotate(45deg);
}

.close:after {
    transform: rotate(-45deg);
}

@media only screen and (max-width: 1024px) {
    .menu {
        width: 580px;
        margin-left: -290px;
    }
}

@media only screen and (max-width: 960px) {
    .menu {
        width: 540px;
        margin-left: -270px;
    }
}

@media only screen and (max-width: 900px) {
    .menu {
        width: 490px;
        margin-left: -245px;
        font-size: 14px;
    }

    .right-date,
    .left-date {
        font-size: 17px;
    }
}

@media only screen and (max-width: 860px) {
    .menu {
        width: 470px;
        margin-left: -235px;
    }
}

@media only screen and (max-width: 840px) {
    .menu {
        width: 600px;
        margin-left: -300px;
    }

    .right-date,
    .left-date {
        bottom: auto;
        top: 15px;
    }
}

@media only screen and (max-width: 680px) {
    .menu {
        display: none;
    }

    #nav-icon {
        display: block;
    }

    .logo img {
        height: 28px;
    }

    .right-date,
    .left-date {
        bottom: 10px;
        top: auto;
        font-size: 16px;
    }

    .header {
        height: 80px;
    }

    #map {
        height: calc(100% - 80px);
    }

}

@media only screen and (max-width: 600px) {
    #about-modal .content {
        width: 90%;
    }
}

@media only screen and (max-width: 400px) {
    .right-date,
    .left-date {
        font-size: 13px;
    }

    .left-date {
        left: 10px;
    }

    .right-date {
        right: 10px;
    }

    .header {
        padding: 10px;
    }

    #nav-icon {
        left: 10px;
    }
}