* {
    box-sizing: border-box; }

html, body {
    padding: 0;
    margin: 0;
    height: 100%;
    width: 100%;
    font-family: sans-serif;
    font-display: optional;
}

html {
    overflow: hidden; }

body {
    color: white;
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -webkit-flex-direction: column;
        -ms-flex-direction: column;
            flex-direction: column;
    -webkit-flex-wrap: nowrap;
        -ms-flex-wrap: nowrap;
            flex-wrap: nowrap;
    -webkit-box-pack: start;
    -webkit-justify-content: flex-start;
        -ms-flex-pack: start;
            justify-content: flex-start;
    -webkit-box-align: stretch;
    -webkit-align-items: stretch;
        -ms-flex-align: stretch;
            align-items: stretch;
    -webkit-align-content: stretch;
        -ms-flex-line-pack: stretch;
            align-content: stretch;
    background: #757575; }  

header {
    top: 0;
    width: 100%;
    height: 56px;
    background-color: black;
    color: white;
    display: flex;
    align-items: center;
    position: fixed;
}
header h1 {
    padding: 0 1em;
    font-size: 20px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: calc(100% - 56px);
}

header h1 span {
    padding: 0 1em;
}

main {
    overflow: hidden;
    width: 100%;
    max-width:800px;
-webkit-box-flex: 1;
-webkit-flex: 1;
    -ms-flex: 1;
        flex: 1;
overflow-x: auto;
overflow-y: auto;
-webkit-overflow-scrolling: touch;
padding: 16px;
position: relative;
box-sizing: border-box;
background:black;
color:white;
border-radius: 2px;
margin: 56px auto 0 auto;
}

.button {
    display: block;
    margin: auto;
    text-align: center;
    margin: 2em;
}

.button a{
    margin: 2px;
    display: inline-block;
    border-radius: 1em;
    padding: .5em 1em;
    background-color: gray;
    color: black;
    text-decoration: none;
    font-weight: bold;
}

a {
    text-decoration: none;
    color: white;
}

nav {
    box-sizing: border-box;
    position: fixed;
    right: 0;
    display: flex;
    width: 100%;
    max-width: 300px;
    justify-content: space-between;
}

nav .element {
    box-sizing: border-box;
    width: 33%;
    display: flex;
    padding: 10px;
    text-align: center;
    display: block;
    min-width: 56px;
    min-height: 56px;
    max-height: 56px;
}

nav .element .texto {
    overflow: hidden;
    text-overflow: ellipsis;
}

img {
    max-width: 100%;
}

.botonF2 {
    cursor: pointer;
    width:40px;
    height:40px;
    border-radius:100%;
    background:#607D8B;
    right:0;
    bottom:0;
    border:none;
    outline:none;
    color:#FFF;
    font-size:24px;
    box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
    transition:.3s; 
  }