@import url(https://fonts.googleapis.com/css?family=Poppins);
*
{
    margin:0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}
:root
{
    --clr: #13142d;
}
body
{  
background: var(--clr);    
}

header
{
    position: fixed ;
    top: 0;
    width: 100%;
    background: #2196f3;
    padding: 10px 50px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100000;

}

header .logo
{
    position: relative;
    color: #fff;
    font-size: 2em;
    font-weight: 600;
    text-decoration: none;
}

header nav 
{
    display: flex;
    gap: 10px;


}

header nav a
{
    position: relative;
    text-decoration: none;
    padding: 11px 20px;
    color: #fff;
    letter-spacing: 0.1em;
    font-weight: 400;

}

header nav #indicator
{
    position: absolute;
    width: 88px;
    height:58px;
    background:var(--clr);
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
    transition: 0.5s;

}
header nav #indicator::before

{
content: '';
position: absolute;
bottom: 0;
left: -30px;
width: 30px;
height: 30px;
background:transparent;
border-bottom-right-radius: 20px;
box-shadow: 5px 5px 0 5px var(--clr);
}

header nav #indicator::after

{
content: '';
position: absolute;
bottom: 0;
right: -30px;
width: 30px;
height: 30px;
background:transparent;
border-bottom-left-radius: 20px;
box-shadow: -5px 5px 0 5px var(--clr);
}