why is arrowBackground transitioning instantly and doesnt take 0.5s

//* Define variables and html elements

const sidebar = document.querySelector('.sidebar');
const arrow = document.querySelector('.arrow');

//* Add event listeners

sidebar.addEventListener('mouseout', () => {
  arrow.style.transitionDelay = '0s';
  sidebar.style.transitionDelay = '0.05s';
})

sidebar.addEventListener('mouseover', () => {
  arrow.style.transitionDelay = '0.05s';
  sidebar.style.transitionDelay = '0s';
})
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  width: 100vw;
  display: flex;
}

.sidebar {
  position: fixed;
  height: 100vh;
  background-color: black;
  width: 80px;
  transition: all 0.5s ease;
  z-index: 0;
}

.arrow {
  position: relative;
  left: 7.5px;
  right: 7.5px;
  top: 7.5px;
  width: 65px;
  height: 65px;
  fill: rgb(115, 151, 162);
  transition: all 0.5s ease;
  z-index: 2;
}

.arrowBackground {
  position: absolute;
  top: 0;
  width: 82px;
  height: 80px;
  background-color: rgb(30, 30, 30);
  z-index: 1;
  border: 2px solid rgb(50, 50, 50);
  transition: all 0.5s ease;
}

.sidebar:hover {
  width: 240px;
}

body:has(.sidebar:hover) .arrow {
  transform: rotate(180deg);
  left: 167.5px;
}

body:has(.sidebar:hover) .arrowBackground {
  left: 160px;
}
<section class="sidebar">
  <div class="icons">
    <div>
      <svg class="icon arrow" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><path d="M9.4 233.4c-12.5 12.5-12.5 32.8 0 45.3l160 160c12.5 12.5 32.8 12.5 45.3 0s12.5-32.8 0-45.3L109.2 288 416 288c17.7 0 32-14.3 32-32s-14.3-32-32-32l-306.7 0L214.6 118.6c12.5-12.5 12.5-32.8 0-45.3s-32.8-12.5-45.3 0l-160 160z"/></svg>
      <div class="arrowBackground"></div>
    </div>
  </div>
</section>

when i hover over the side bar the arrow and sidebar take 0.5s to transition but the arrow background class does it straight away and i dont know why and i want to it to take 0.5s to transition but i dont know how i would fix it

i tried rearranging some code but nothing worked at all and i tried setting the transition delay in javascript but that still didnt work

>Solution :

Add left: 0; to arrowBackground otherwise it doesn’t know what it’s transitioning from

//* Define variables and html elements

const sidebar = document.querySelector('.sidebar');
const arrow = document.querySelector('.arrow');

//* Add event listeners

sidebar.addEventListener('mouseout', () => {
  arrow.style.transitionDelay = '0s';
  sidebar.style.transitionDelay = '0.05s';
})

sidebar.addEventListener('mouseover', () => {
  arrow.style.transitionDelay = '0.05s';
  sidebar.style.transitionDelay = '0s';
})
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  width: 100vw;
  display: flex;
}

.sidebar {
  position: fixed;
  height: 100vh;
  background-color: black;
  width: 80px;
  transition: all 0.5s ease;
  z-index: 0;
}

.arrow {
  position: relative;
  left: 7.5px;
  right: 7.5px;
  top: 7.5px;
  width: 65px;
  height: 65px;
  fill: rgb(115, 151, 162);
  transition: all 0.5s ease;
  z-index: 2;
}

.arrowBackground {
  position: absolute;
  left: 0;
  top: 0;
  width: 82px;
  height: 80px;
  background-color: rgb(30, 30, 30);
  z-index: 1;
  border: 2px solid rgb(50, 50, 50);
  transition: all 0.5s ease;
}

.sidebar:hover {
  width: 240px;
}

body:has(.sidebar:hover) .arrow {
  transform: rotate(180deg);
  left: 167.5px;
}

body:has(.sidebar:hover) .arrowBackground {
  left: 160px;
}
<section class="sidebar">
  <div class="icons">
    <div>
      <svg class="icon arrow" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><path d="M9.4 233.4c-12.5 12.5-12.5 32.8 0 45.3l160 160c12.5 12.5 32.8 12.5 45.3 0s12.5-32.8 0-45.3L109.2 288 416 288c17.7 0 32-14.3 32-32s-14.3-32-32-32l-306.7 0L214.6 118.6c12.5-12.5 12.5-32.8 0-45.3s-32.8-12.5-45.3 0l-160 160z"/></svg>
      <div class="arrowBackground"></div>
    </div>
  </div>
</section>

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