html, body, form {
    margin: 0;
    padding: 0;
}
* {
    font-family: Arial, Helvetica, sans-serif;
    box-sizing:border-box;
}
ul, li {
    line-height: 1.7;
    margin: 0;
}
img {
    width: 100%;
    height: auto;  
    display:block;    
}
h1, h2, h3, h4, h5, h6, p {
    margin:0;
    padding:0;
}
h1 {
    font-size: 2.5rem;
}
h2 {
    font-size: 2.25rem;
}
h3 {
    font-size: 2rem;
}
h4 {
    font-size: 1.75rem;
}
h5 {
    font-size: 1.5rem;
    line-height: 4rem;
}
h6 {
    font-size: 1.25rem;
    line-height: 4rem;
}
p, a {
    font-size: 1rem;
    line-height: 1.7rem;
}
@media (max-width: 480px) {
    html {
        font-size: 15px;
    }
}
@media (min-width: 480px) {
    html {
        font-size: 16px;
    }
}
@media (min-width: 768px) {
    html {
        font-size: 17px;
    }
}
@media (min-width: 992px) {
    html {
        font-size: 18px;
    }
}
@media (min-width: 1200px) {
    html {
        font-size: 20px;
    }
}
.announcement-block-wrapper {
    display: flex;
    flex-wrap: wrap;
}
.announcement-block-inner {
    display:block;
    width: 50%;
}
.announcement-block-inner a {
    display:block;
    width:100%;
}
.nav {
    position: fixed;
    display:block;
    width: 4rem;
    height: 4rem;
    border-radius: 2rem;
    background: rgba(0,0,0,0.4);
}
.back {
    left: 1.5rem;
    bottom: 1.5rem;
}
.nav a {
    display:block;
    padding:1rem;
    width:100%;
    height:100%;
}
.nav-icon {
    width:100%;
    height:100%;
    color:#ffffff;
}
.main {
    box-sizing:border-box;
    padding: 1.5rem;
}
.category {
    color:#777777;
    margin-bottom: .5rem;
}
.title {
    margin-bottom: 1rem;
}
.banner {
    margin-bottom: 2rem;
}
.highlight {
    background:rgb(255, 255, 0);
}