Untitled

* {
   box-sizing: border-box;
   font-family: Cambria;

}
header, footer{
   background: #829eb9;
   color: white;
   text-align: center;
   padding: 10px;
}
#lewa, #prawa {
   background: #B3C6D9;
   height: 400px;
   width: 25%;
   padding-top: 100px;
}
#srodkowa{
   background: #E0E9F1;
   height: 400px;
   width: 50%;
   text-align: center;
   padding-top: 100px;
}
table{
   border: 1px solid dimgray;
   width: 80%;
   margin: auto;
   border-collapse: collapse;
}
td, th{
   border: 1px solid dimgray;
   border-collapse: collapse;
}
td:hover{
   background: steelblue;
   color: white;
}
img{
   width: 100%;
   border-radius: 20px;
}
main{
   display: flex;
}