style.css

/*General settings*/
html {
    box-sizing: border-box;
    font-family: "Arial Rounded MT Bold", "Helvetica Rounded", Arial,
        sans-serif;
}

*,
*:before,
*:after {
    box-sizing: inherit;
}

body {
    margin: 0;
    min-height: 100vh;

}

/*nav bar settings*/
nav {
    position: relative;
    perspective: 600px;
}

nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
}

.nav-bar>li {
    position: relative;
    display: flex;
    justify-content: center;
}


.nav-bar>li>a {
    color: #000; 
    font-size: 1em;
    padding: 10px 20px;
    margin: 20px;
    text-decoration: none;
    display: inline-block;
   
}

.nav-link-dropdown,
.sub-link-menu {
    padding-left: 15px;
}

.sub-link-menu {
    color: #afafaf;
    white-space: nowrap;
}

.sub-link-menu:hover {
    color: #565656;
}

.dropdown {
    opacity: 0;
    display: none;
    position: absolute;
    overflow: hidden;
    padding: 20px;
    top: -20px;
    border-radius: 2px;
    transition: all 0.5s;
    transform: translateY(100px);
    will-change: opacity;
}

/*general link settings*/
.dropdown a {
    text-decoration: none;
    color: #000;
}

a.button {
    background: black;
    display: block;
    padding: 10px;
    color: white;
    margin-bottom: 10px;
}

/*first submenu settings*/
.menu-sub-icon {
    width: 40px;
    height: 40px;
    float: left;
}

.menu-sub-main-text {
    margin-left: 15px;
}

.cols-wrapper {
    display: flex;
}

.cols-sections>.list-container>.col-title {
    font-size: 0.8em !important;
    float: left !important;
    text-transform: uppercase;
    display: block;
    margin-bottom: 50px;
    text-align: left !important;
}

.cols-wrapper>.cols-sections {
    display: inline-block !important;
    padding: 0;
}

.list-container {
    padding: 0;
    margin: 0 auto;
    list-style: none;
    display: inline-block;
}

.list-item {
    padding: 10px 0 10px 0;
    width: 260px;
    height: auto;
    margin: 0 auto;
    line-height: 20px;
    color: #000;
    font-size: 0.8em;
    text-align: left;
    float: left;
}

/*trigger events settings*/
.trigger-enter .dropdown {
    display: block;
}

.trigger-enter-active .dropdown {
    opacity: 1;
}

.dropdownBackground {
    width: 100px;
    height: 100px;
    position: absolute;
    background: #fff;
    border-radius: 4px;
    box-shadow: 0 50px 100px rgba(50, 50, 93, 0.1),
        0 15px 35px rgba(50, 50, 93, 0.15), 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s, opacity 0.1s, transform 0.2s;
    transform-origin: 50% 0;
    display: flex;
    justify-content: center;
    opacity: 0;
}

.dropdownBackground.open {
    opacity: 1;
}

.arrow {
    position: absolute;
    width: 15px;
    height: 15px;
    display: block;
    background: white;
    transform: translateY(-50%) rotate(45deg);
}

/*second and third submenu settings*/
.usecases {
    min-width: 260px;
}

.usecases li, .pricing li {
    font-size: 0.8em;
    line-height: 20px;
    padding: 10px 0 10px 0;
    display: block;
}

.sub-pad {
    padding-left: 34px;
    line-height: 25px;
}