body{
    margin: 0 auto;
    font-family: Arial;
}
header, footer{
    background-color: saddlebrown;
    color: #fff;
    height: 100px;
    box-sizing: border-box;
}
.lewy{
    width: 55%;
    font-size: 120%;
    float: left;
}
.srodkowy{
    width: 25%;
    float: left;
}
.prawy{
    width: 20%;
    text-align: right;
    float: right;
}
main{
    background-color: snow;
    padding: 70px;
}
a{
    border: 2px dotted saddlebrown;
    background-color: snow;
    color: saddlebrown;
    padding: 20px;
    line-height: 100px;
}
ol {
	list-style-type: lower-latin;
}