body {
    background-image: url("./../img/back.png");
    background-position: center center;
    background-attachment: fixed;
    background-size: cover;
    
}
h1{
    text-align: center;
}
nav{
    background-color:#E0A089;
}
ul {
    margin: 0;
    padding: 0;
    overflow: hidden;
}
ul li{
    display: inline;
    float: left;
}
li a {
    text-align: center;
    color: white;
    display: block;
    padding: 14px 16px;
}
ul li:hover {
    border-style:solid;
    border-color: white;
    border-width: 2px;
}
a:link{
    color: blue;
}
a:visited{
    color: blue;
}
a:hover {
    color: white;
}
a:active {
    color: silver;
}
.content {
    text-align: center;
    font-family: serif;
    font-size: 2.5vw;
    color: #006699;
    width: 50%;
    margin: auto;
    background-color: #FF9900;
}
.foot {
    text-align: center;
    font-size: 1.75vw;
    bottom: 0px;
    left: 0px;
    position: fixed;
    width: 100%;
    background-color:#E0A089;
}
#thumbnail {
    height: 150px;
    width: 200px;
}
.title {
    text-decoration: underline;
    font-size: 25px;
    text-shadow: 3px 2px silver;
}

div { /* 5 rule */
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 10px 20px 0 rgba(0, 0, 0, 0.19);
}

p { /* 1 rule */
    border-style: solid;
    border-width: 2px;
}

header { /* 2 rule */
    margin: auto; 
    background-color: gray;
    opacity: 0.6;
}

#tabs { /* 3 rule */
    font-size: 2vw;
    opacity: 0.6;
}

#grad { /* 4 rule */
    background-image: linear-gradient(-90deg, red, #E0A089);
}