styles.css

/* ========================================================================== *\
   RESET
\* ========================================================================== */
*,
*:before,
*:after {
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}
html {
    font-family: sans-serif;
    -ms-text-size-adjust: 100%;
    -webkit-text-size-adjust: 100%;
}
body,
div,
dl,
dt,
dd,
h1,
h2,
h3,
h4,
h5,
h6,
pre,
code,
form,
fieldset,
legend,
input,
textarea,
p,
blockquote,
th,
td {
	margin: 0;
	padding: 0;
}
html, body {
    height: 100%;
    margin:0;
    padding:0;
}

/* ========================================================================== *\
   HTML Style ELEMENTS (default)
\* ========================================================================== */
BODY {
	font-family: "Josefin Sans", sans-serif;
}
img {
  max-width: 100%;
  height: auto;
  box-sizing: border-box;
  vertical-align: middle;
}

/* Imagem de fundo */
html { 
    background: url(general.jpg) no-repeat center center fixed; 
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}

/* logo */
#logo {
	position: relative;
	min-height: 185px;
	background: url(logo.png) no-repeat;
	background-position: center center;	
}

/* Formulário nickname centrado */
.outer {
    display: table;
    position: absolute;
    height: 100%;
    width: 100%;
}
.middle {
    display: table-cell;
    vertical-align: middle;
}
.inner {
    margin-left: auto;
    margin-right: auto; 
    width: 90%;
}
@media (min-width: 768px) {
    .inner {
        width: 40%;
    }
}
@media (min-width: 992px) {
    .inner {
        width: 35%;
    }
}
@media (min-width: 1200px) {
    .inner {
        width: 30%;
    }
}
/* formulário nickname */
#container_nickname {
    width:100%;
    background-color: #697a83;
    opacity: 0.6;
    font-size: 2.2em;
    text-align: center;
    padding: 1em;
}
.general_textbox {
	width: 100%;
	padding: 0.4% 1%;
	background-color: rgba(255,255,255,0.2);
	height: 54px;
  	border: none;
    font-size: 0.7em;
    color: #FFF;
    font-family: inherit;
    font-weight: 100;
    text-align: center;
}
@media (min-width: 768px) {
    /* Small devices (tablets, 768px and up) */
    .general_textbox {
        width: 80%;
    }
}
@media (min-width: 992px) {
    /* Medium devices (desktops, 992px and up) */
    .general_textbox {
        width: 75%;
    }
}
@media (min-width: 1200px) {
    /* Large devices (large desktops, 1200px and up) */
    .general_textbox {
        width: 70%;
    }
}
button {
    width: 90%;
	background-color: rgba(0, 0, 0, 0.4);
    color: #C8C8C8;
	text-align: center;
	padding: 0.4% 1%;
	margin: 14px 0 0;
	outline: none;
	border: none;
  	line-height: normal;
    font-family: inherit;
	font-size: 1.0em;
	font-weight: 100;
	cursor: pointer;
    -webkit-transition-duration: 0.3s;
    transition-duration: 0.3s;
    -webkit-transition-property: background-color;
    transition-property: background-color;    
}
@media (min-width: 768px) {
    /* Small devices (tablets, 768px and up) */
    button {
        width: 80%;
    }
}
@media (min-width: 992px) {
    /* Medium devices (desktops, 992px and up) */
    button {
        width: 75%;
    }
}
@media (min-width: 1200px) {
    /* Large devices (large desktops, 1200px and up) */
    button {
        width: 70%;
    }
}
button:HOVER {
	background: rgba(0, 0, 0, 1);
}

/* ========================================================================== *\
   HELPERS > Notifications
\* ========================================================================== */
.bg-success {
    background-color: rgba(193, 237, 20, 0.90);
    font-size: 0.6em;
    color: #000;
    padding: 0.5em;
}
.bg-error {
    background-color: rgba(208, 26, 15, 0.90);
    font-size: 0.6em;
    color: #FFF;
    padding: 0.5em;
}

/* Chat */
#sidebar {
    width: 200px;
    height: inherit;
    float: left;
    background-color: rgba(128,128,128,0.95);
}
#primary {
    margin-left: 200px;
    height: inherit;
}
#log {
    height: 80%;
    background-color: rgba(169,169,169,0.95);
    overflow: auto;
}
#composer {
    height: 20%;
    background-color: rgba(195,195,195,0.95);
}

#composer, #log
{
    padding: 20px;
}

.textbox_message {
	width: 100%;
	padding: 0.4% 1%;
	background-color: rgba(255,255,255,0.2);
	height: 54px;
  	border: none;
    font-size: 2em;
    color: #000;
    font-family: inherit;
    font-weight: 100;
}
#btn_send {
  width: 100%;
	background-color: rgba(0, 0, 0, 0.4);
  color: #C8C8C8;
	text-align: center;
	padding: 0.4% 1%;
	margin: 14px 0 0;
	outline: none;
	border: none;
  line-height: normal;
  font-family: inherit;
	font-size: 1.0em;
	font-weight: 100;
	cursor: pointer;
    -webkit-transition-duration: 0.3s;
    transition-duration: 0.3s;
    -webkit-transition-property: background-color;
    transition-property: background-color;    
}
#btn_send:HOVER {
	background: rgba(0, 0, 0, 1);
}
.long-content {
    font-size: 2em;
    height: 3000px;
    display: block;
}