Hi there, how can I influence the height of the nav bar at my site. See www.soluforyou.com

Note I made a TOP bar as as well, and use CSS to push the nav bar down a bit. 
See the screenshot, the red area needs to be bigger/the same as above.

Here my CSS as well:

/* TOP BAR */
body .easy-notification-bar-container {
    box-sizing: border-box; /* Add this line */
    background-color: #fcfbfa;
    border-bottom: 1px solid #D6D6D6;
    padding: 6px 0;
    position: fixed;
    width: 100%;
    left: 0px !important;
    top: 0;
    z-index: 9999;
    opacity: 0; /* Added for fade-in effect */
    animation: fadeIn 2s forwards; /* Added for fade-in effect */
}

/* SECOND BAR */
.wpml-ls-item ul.sub-menu.tracked-pos {
    border-radius: 10px !important;
    border-top: 0px !important;
}

/* Fade-in effect animation */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@media (max-width: 768px) {
    .easy-notification-bar-container {
        display: none; /* This hides the top bar on mobile devices */
    }
}

/* NAV PUSHED DOWN FOR TOP BAR */
header {
    padding-top: 38px !important; /* For Desktop */
}

@media screen and (max-width: 768px) {
    header {
        padding-top: 12px !important; /* For Mobile */
    }
}

/* NAV NO SHADOW */
#header-outer {
    box-shadow: none !important;
}

/* HOME intro intro header */
.intro {
    text-transform: uppercase !important;
    font-family: "Sweet-Sans-Pro", sans-serif !important;
    font-weight: 700 !important;
    font-size: 14px !important;
}

/* alle BUTTONs font */
div.nectar-cta.button-sweet .text {
    text-transform: uppercase !important;
    font-family: "Sweet-Sans-Pro", sans-serif !important;
}

/* HOME H1 closer to intro header - Desktop */
@media screen and (min-width: 992px) {
    h1 {
        margin-top: -11px !important;
    }
}

/* HOME H1 closer to intro header - Mobile */
@media screen and (max-width: 991px) {
    h1 {
        margin-top: -5px !important;
    }
}

/* HOME Header pop-up Woocommerce */
.single-product div.product h1.product_title {
  font-family: 'juana' !important;
  font-size: 22px !important;
}

.nectar-quick-view-box .product_title {
  font-family: 'juana' !important;
  font-size: 40px !important;
}

/* FAQ Header */
.FAQ-juana h3 {
    font-family: 'juana'!important;
    font-weight: normal !important;
}

/* SHOP subheaders filter styling */
#sidebar .wc-blocks-filter-wrapper h3.wp-block-heading {
    font-size: 14px;
}

/* SHOP filter by price fileld circles */
div.wc-block-price-filter__range-input-wrapper.wc-block-components-price-slider__range-input-wrapper input[type="range"]::-webkit-slider-thumb {
  background: black;
}
div.wc-block-price-filter__range-input-wrapper.wc-block-components-price-slider__range-input-wrapper input[type="range"]::-moz-range-thumb {
  background: black;
}

/* SHOP Price filter more elegant */
.wc-block-components-price-slider__range-input-wrapper:before{
    background:transparent !important;
}
.wc-block-components-price-slider__range-input-progress{
    height:2px !important;
    top:-50% !important;
}
div.wc-block-price-filter__range-input-wrapper.wc-block-components-price-slider__range-input-wrapper input[type="range"]::-webkit-slider-thumb {
    height:4px;
    width:4px;
}

/* SHOP Checkboxes more thin */
.wc-block-components-checkbox .wc-block-components-checkbox__input[type=checkbox]{
    border:1px solid black !important;
}

/* HOME - SHOP Prices size */
.home .woocommerce ul.products li.product.material .price, .home .woocommerce ul.products li.product .price, 
.home .woocommerce ul.products li.product.material .price .woocommerce-Price-amount {
  font-size: 17px !important;
}

/* SHOP Product Title on product page */
.single-product div.product h1.product_title {
    font-size: 32px !important;
}

/* SHOP Product Price  */
.single-product.woocommerce div.product .summary p.price {
  font-size: 15px;
}

/* SHOP No bullshit below pictures  */
div#tab-additional_information {
 display: none !important;
 }
 
 /* SHOP 'Related products'  */
 #ajax-content-wrap .related.products > h2,#ajax-content-wrap .upsells.products > h2,#ajax-content-wrap #tab-reviews #reviews #comments h2,.woocommerce .woocommerce-tabs #tab-additional_information h2,#ajax-content-wrap #reviews #reply-title,.woocommerce-tabs #reviews .nectar-average-count,#review_form_wrapper.modal .comment-reply-title,.woocommerce-tabs[data-tab-style="fullwidth_stacked"] p.woocommerce-noreviews {
    font-family: 'juana' !important;
}

Perfect, thanks Andrew!