* {
    box-sizing: border-box;
}

body {
    font-family: Arial;
    margin: 0;
}


a { 
    background-color: #555; 
    text-decoration: none;
    padding-left: 10px;
    padding-right: 10px;
}

a:link, a:visited {
    color: white;
    border: 1px solid #555;
    border-radius: 0 14px;
}

a:hover {
    color: #555;
    background-color: #ebebeb;
    border: 1px solid #ebebeb;
    border-radius: 25px;
}

a:active { color: cadetblue; }


/* HEADER --------------------------------------------*/

.header .title {
    background-color: cadetblue;
    text-align: center;
    padding: 60px;
    color: #ebebeb;
}

.nav-bar {
    display: flex;
    justify-content: space-between;
    padding: 5px;
    align-items: center;
    background-color: #555;
}

.header nav a {
    padding: 5px 20px;
    margin: 0 10px 0 10px;
    text-align: center;
}

.nav-left {
    display: flex;
    justify-content: flex-start;
}

.nav-right {
    display: flex;
    justify-content: flex-end;
}

/* MAIN CONTENT --------------------------------------------*/

.main-content {
    display: flex;
    flex-wrap: wrap;
}

.side {
    flex: 30%;
    background-color: #f1f1f1;
    padding: 20px;
}

.main {
    flex: 70%;
    background-color: #ebebeb;
    padding: 20px;
}

/* RESPONSIVE -----------------------------------------------------*/

@media screen and (max-width: 700px) {
    .main-content, .nav-bar {
        flex-direction: column;
    }
}