Animated Menu

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CSS

html {

box-sizing: border-box;
--bgColorMenu : #1d1d27;
--duration: .7s;

}

html *,
html *::before,
html *::after {

box-sizing: inherit;

}

body{

margin: 0;
display: flex;
height: 100vh;
overflow: hidden;
align-items: center;
justify-content: center;
background-color: #ffb457;
-webkit-tap-highlight-color: transparent;
transition: background-color var(--duration);

}

.menu{

margin: 0;
display: flex;
/* Works well with 100% width  */
width: 32.05em;
font-size: 1.5em;
padding: 0 2.85em;
position: relative;
align-items: center;
justify-content: center;
background-color: var(--bgColorMenu);

}

.menu__item{

all: unset;
flex-grow: 1;
z-index: 100;
display: flex;
cursor: pointer;
position: relative;
border-radius: 50%;
align-items: center;
will-change: transform;
justify-content: center;
padding: 0.55em 0 0.85em;
transition: transform var(--timeOut , var(--duration));

}

.menu__item::before{

content: "";
z-index: -1;
width: 4.2em;
height: 4.2em;
border-radius: 50%;
position: absolute;
transform: scale(0);
transition: background-color var(--duration), transform var(--duration);

}

.menu__item.active {

transform: translate3d(0, -.8em , 0);

}

.menu__item.active::before{

transform: scale(1);
background-color: var(--bgColorItem);

}

.icon{

width: 2.6em;
height: 2.6em;
stroke: white;
fill: transparent;
stroke-width: 1pt;
stroke-miterlimit: 10;
stroke-linecap: round;
stroke-linejoin: round;
stroke-dasharray: 400;

}

.menu__item.active .icon {

animation: strok 1.5s reverse;

}

@keyframes strok {

100% {

stroke-dashoffset: 400;

}

.menu__border{

left: 0;
bottom: 99%;
width: 10.9em;
height: 2.4em;
position: absolute;
clip-path: url(#menu);
will-change: transform;
background-color: var(--bgColorMenu);
transition: transform var(--timeOut , var(--duration));

}

.svg-container {

width: 0;
height: 0;
}

@media screen and (max-width: 50em) {
.menu{
    font-size: .8em;
}
}

JS

"use strict";

const body = document.body;
const bgColorsBody = ["#ffb457", "#ff96bd", "#9999fb", "#ffe797", "#cffff1"];
const menu = body.querySelector(".menu");
const menuItems = menu.querySelectorAll(".menu__item");
const menuBorder = menu.querySelector(".menu__border");
let activeItem = menu.querySelector(".active");

function clickItem(item, index) {

menu.style.removeProperty("--timeOut");
    
    if (activeItem == item) return;
    
    if (activeItem) {
        activeItem.classList.remove("active");
    }

item.classList.add("active");
    body.style.backgroundColor = bgColorsBody[index];
    activeItem = item;
    offsetMenuBorder(activeItem, menuBorder);
    
    
}

function offsetMenuBorder(element, menuBorder) {

const offsetActiveItem = element.getBoundingClientRect();
    const left = Math.floor(offsetActiveItem.left - menu.offsetLeft - (menuBorder.offsetWidth  - offsetActiveItem.width) / 2) +  "px";
    menuBorder.style.transform = `translate3d(${left}, 0 , 0)`;

}

offsetMenuBorder(activeItem, menuBorder);

menuItems.forEach((item, index) => {

item.addEventListener("click", () => clickItem(item, index));
    
})

window.addEventListener("resize", () => {
    offsetMenuBorder(activeItem, menuBorder);
    menu.style.setProperty("--timeOut", "none");
});

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