index.css

*{
    box-sizing: border-box;
}

body{
    text-align: center;
    background-image: url("./circles-dark.png");

}
.wrapper{
  min-height: calc(100vh - 140px);
}
header{
    border-bottom: 4px solid #cccccc;
    margin-bottom: 50px;
    background: #ffffff;
}
h1, h2, h3{
    font-family: 'Georgia', Times, Times New Roman, serif;
    font-weight: bolder;
}
p{
    font-family:'Arial', 'Helvetica Neue', Helvetica, sans-serif;
}
.header{
    width: 960px;
    margin:auto;
    overflow: auto;
    
}
.title{
    padding: 30px;
    float: left;
    background: #4aaaa5;
    color:white;
    font-size:3em;
}
.nav{
    padding-top: 50px;
    float: right; 
}
.nav a{
    display: inline-block;
    border-right: 1px solid lightgray;
    padding-right: 6px;
    text-decoration: none;
    color:gray;
}
a:last-child{
    border:  none;
}
.main{
    width:960px;
    margin:auto;  
    overflow: auto;
    min-height: calc(100vh-140px);
}
.content{
    background: #ffffff;
    width: 650px;
    margin-right: 20px;
    text-align: left;
    padding:50px;
    overflow: auto;
    float: left;
}
.content h2{
    font-size: 1.8em;
    color: #4aaaa5;
}
.content img{
    width: 240px;
    float:left;
    margin: 20px 20px 0 0;
}
.content hr{
    display: block;
    margin-top: 20px;
    padding: 2px;
    background:lightgray;
    border:none;
}
.content p{
    line-height: 2em;
    margin-top: 20px;
    font-size: 1.5em;
    color: gray;
}
.contact{
    width: 270px;
    margin-left: 20px;
    background:#ffffff;
    padding:20px;
    float:left;
}
.contact hr{
    padding:1px;
    border: none;
    background: lightgray;
    margin: 10px 0;
}
.contact h3{
    font-size: 1.2em;
    text-align: left;
    color: #4aaaa5;
}
.contact img{
    width: 70px;
    margin: 0 10px 0 0;
    float: left;
}
.contact img:last-child{
    margin-right: 0;
}
.contact img:last-child::after{
    display: block;
    clear: left;
}
.contact::after{
    display: block;
    clear: left;
}
footer{
    
    height:100px;
    margin-top: 40px;
    padding: 40px;
    background: #5c5c5c;
    border-top: 10px solid #4aaaa5;
}
footer h3{
    color: lightgray;
}