header-nav.css

body #flex-container header nav {
    display: flex;
    font-size: medium;
    width: 100%;
    height: auto;
    flex-direction: row; 
    justify-content: space-between;
}
body #flex-container header nav .left-group {
    display: flex;
    width: 100px;
    height: auto;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
}
body #flex-container header nav .right-group {
    display: flex;
    width: 300px;
    height: auto;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
}
body #flex-container header nav .right-group #apps-logo {
    display: grid;
    text-decoration: none;
    width: 50px;
    height: 50px;
    align-items: center;
    justify-items: center;
    border-radius: 50%;
}
body #flex-container header nav .right-group #apps-logo:hover {
    background: hsla(0, 0%, 0%, 0.1);
}
body #flex-container header nav .right-group #apps-logo .apps-logo {
    display: grid;
    width: 25px;
    height: 25px;
    grid-template-columns: 1fr 1fr 1fr;
    grid-template-rows: 1fr 1fr 1fr;
    justify-items: center;
    align-items: center;
}
body #flex-container header nav .right-group #apps-logo .apps-logo div {
    width: 5px;
    height: 5px;
    background: rgb(88, 88, 88);
    border-radius: 50%;
}
body #flex-container header nav .right-group #sign-in{
    display: block;
    text-decoration: none;
    background:hsl(240, 100%, 50%);
    color: white;
    width: 100px;
    height: 40px;
    text-align: center;
    line-height: 40px;
    border-radius: 10%;
}
body #flex-container header nav .right-group #sign-in:hover {
    background: hsl(205, 100%, 50%);
}