*{
    margin: 0;
    padding: 0;
}
.clearfix afer{
    content: "";
    display: block;
    clear: both;
}
nav{
    width: 100%;
    height: 50px;
    background-color: red;
    position: fixed;
    top:0;
    left:0;
    z-index:1;

}
nav ul{
    line-height: 50px;
    width: 100%;
}
nav ul li{
    float: left;
    list-style: none;
    width: 25%;
    text-align: center;
}
nav ul li a{
    text-decoration: none;
    color: white;
    font-size: 20px;
    text-transform: uppercase;
    display: block;
    font-family: arial;
}
nav ul li a:hover{
    color: blue;
    background-color: white;
}
aside{
    background-image: url(https://static4.redcart.pl/templates/images/thumb/9595/800/800/pl/0/templates/images/products/9595/124-9093_0.jpg);
    background-attachment: fixed;
    background-size: cover;
    height: calc(100vh - 40px);
}
aside h1{
    line-height: 40px;
    font-family: tahoma;

}
header{
    height: 100vh;
}
.jeden{
    background-color: pink;
    width: 25%;
    float: left;
    height: 100%;
    position: relative;
}
.dwa{
    background-color:chartreuse;
    width: 25%;
    float: left;
    height: 100%;
    position: relative;
}
div.dwa img{
    width: 100%;
    height: 34%;
    position: absolute;
    top: 66%;
    left: 50%;
    transform: translate(-50%, 0%)
}
.trzy{
 background-color:darkgreen;
    width: 25%;
    float: left;
    height: 100%;
    position: relative;
}
.piec{
    background-color:aqua;
    float: left;
    width: 25%;
    height: 100%;
    position: relative;
}
div.piec h1{
    position: absolute;
    top: 50%;
    right:0;
    transform: translate(-50%, -50%)
}
footer{
    height: 50px;
    text-align: center;
    background-color:fuchsia;
}
footer p{
    color: white;
    line-height: 50px;
    font-size: 20px;
    font-family: arial;
    background-color:chocolate;
    position:absolute;
    top: calc(100vh-50px);
    left: 50%;
    transform: translate(-50%);
    padding: 0 100px;

}
table{
    position: absolute;
    top: 120px;
    left: 50%;
    border-style: dotted;
    transform: translate(-50%, -50%)
}
ol{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%)
}