/t/ - Технології

header, footer {
border:2px solid black;
width: calc(80% + 70px);
background-color: silver;
margin: 10px;
padding: 5px;
border-radius: 15px;
float: left;
margin-left: 5%;
margin-right: 5%;
}

#leftBlock, #Infopage, #RightBlock {
border: 2px solid black;
background-color: silver;
margin: 10px;
padding: 5px;
border-radius: 15px;
float: left;
}

#leftBlock, #RightBlock {
width: 20%;
}

#Infopage {
width: 20%;
}

#leftBlock {
margin-left: 5%;
}

#RightBlock {
margin-right: 5%;
}