Problem with invisible burger menu

Hi,

I have changed my website to have only mobile menu on all display sizes but recently it changed and now it's invisible.

Don't know what cases the problem in my CSS as it was working before.

Can you help me figure this out?

Here's the website: https://theiconagency.pl/

You can hover your mouse to top right and you will find the burger 🙂

The code:

//Below is code that edits how contact form looks like

.form-wrapper .field-list .form-item.field input {
  background-color: #fefefe !important;
  outline: 0 !important;
  border-width: 0 0 1px !important;
  border-color: #0000FF !important;
}

.form-wrapper .field-list .form-item.field textarea {
  background-color: #fefefe !important;
  outline: 0 !important;
  border-width: 0 0 1px !important;
  border-color: #0000FF !important;
}

.form-wrapper .field-list .title {
  font-family: 'Montserrat', sans-serif !important;
  font-size: 12px !important;
  color: #0000FF !important;
  letter-spacing: .15em !important;
  text-transform: lowerrcase !important;
}

.form-wrapper .sqs-button-element--primary {
  background: white !important;
  color: #0000FF !important;
  width: 40% !important;
}

//Below is code that edits how menu looks like

/* 768 for tablet - desktop - 992 for desktop */

@media screen and (min-width:768px) {
  // Center logo
  .header-layout-branding-center-nav-center .header-title-nav-wrapper {
  display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    flex: 0 0 100% !important;
    justify-content: center;
    align-content: center;
    margin-left: auto;
}
  
  /* hide navigation */
    .header-nav {
    display: none;
}
  /* Hide header button */
	.header-actions {
    display: none;
}
	/* show burger */
	.header-burger {
  	display: flex!important;
}
/* Show overlay mobile menu */
.header--menu-open .header-menu {
opacity: 1;
visibility: visible;
  }
}

section[data-section-id="63614429c2905078dae8ec86"] {
  .desktop-arrows, .mobile-arrows {
    display:none !important;
  }
}



.gallery-reel-item img{

  }


.gallery-reel-item-src {
 margin-right: 50px;
  
}

/* Embed script space */
.fe-6361713a2ae2de037739f323 {
    grid-template-rows: repeat(6,minmax(calc(~"var(--container-width) * var(--row-height-scaling-factor)"), auto)) !important;
}

Because current burger icon is white color

Add this to Design > Custom CSS to fix problem

body:not(.header--menu-open) header#header .burger-inner>div {
    background-color: var(--navigationLinkColor) !important;
}