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HTML 

              
                <nav class="menu">
  <ol>
    <li class="menu-item">
      <a href="#0" class="home">
        <i class="ion ion-md-home"></i>
        <span>Home</span>
      </a>
    </li>
    <li class="menu-item">
      <a href="#0" class="about">
        <i class="ion ion-ios-hand-outline"></i>
        <span>About</span>
      </a>
    </li>
    <li class="menu-item">
      <a href="#0" class="widgets">
        <i class="ion ion-ios-aperture-outline"></i>
        <span>Widgets</span>
        <div class="dots"></div>
      </a>
      <ol class="sub-menu">
        <li class="menu-item item--a"><a href="#0" class="item--a"><span>Big Widgets</span></a></li>
        <li class="menu-item item--b"><a href="#0" class="item--b"><span>Bigger Widgets</span></a></li>
        <li class="menu-item item--b"><a href="#0" class="item--c"><span>Huge Widgets</span></a></li>
      </ol>
    </li>
    <li class="menu-item">
      <a href="#0" class="kabobs">
        <i class="ion ion-ios-bonfire-outline"></i>
        <span>Kabobs</span>
      </a>
      <ol class="sub-menu">
        <li class="menu-item"><a href="#0" class="item--a"><span>Shishkabobs</span></a></li>
        <li class="menu-item"><a href="#0" class="item--b"><span>BBQ kabobs</span></a></li>
        <li class="menu-item"><a href="#0" class="item--c"><span>Summer kabobs</span></a></li>
      </ol>
    </li>
    <li class="menu-item">
      <a href="#0" class="contact">
        <i class="ion ion-ios-mail-outline"></i>
        <span>Contact</span>
      </a>
    </li>
  </ol>
</nav>
!

CSS 

              
                html {
    box-sizing: border-box;
}
*, *:before, *:after {
    box-sizing: inherit;
}
body {
    background-image: url("https://www.toptal.com/designers/subtlepatterns/patterns/ignasi_pattern_s.png");
    background-attachment: fixed;
    font: {
        family: 'Roboto', sans-serif;
        weight: 700;
    }
}

ol {
    list-style: none;
    padding: 0;
    margin: 0;
}

a {
    text-decoration: none;
    color: inherit;
}

.menu {
    @media (max-width: 991px) {
        width: 256px;
    }
    ol {
        display: grid;
        grid-template-columns: repeat(5, 1fr);
        @media (max-width: 991px) {
            grid-template-columns: 1fr;
        }
        li {
            position: relative;
            a {
                height: 234px;
                display: flex;
                flex-direction: column;
                align-items: center;
                justify-content: center;
                padding: 1em 0;
                background: #2a98e9;
                color: #fff;
                position: relative;
                z-index: 100;
                overflow: hidden;
                transition: background-color 100ms ease, box-shadow 150ms ease;
                transition-timing-function: cubic-bezier(0.57, 0.21, 0.69, 3.25);
                i {
                    display: block;
                    font-size: 100px;
                    transform: translateY(25px);
                    transition: transform 400ms ease;
                    transition: .4s cubic-bezier(.94,1.60,.5,1);   
                }
                font-size: 40px;
                span {
                    display: block;
                    margin-top: .2em;
                    transition: 
                        transform 300ms ease,
                        opacity 150ms ease;
                    transition: .35s cubic-bezier(.54,1.60,.5,1);   
                    transform: translateY(70px);
                    opacity: 0;
                }
                &.home {
                    background: darken(#1a8fe7, 5);
                }
                &.about {
                    background: lighten(#1a8fe7, 0);
                }  
                &.widgets {
                    background: lighten(#1a8fe7, 5);
                } 
                &.kabobs {
                    background: lighten(#1a8fe7, 10);
                } 
                &.contact {
                    background: lighten(#1a8fe7, 15);
                } 
                &.widgets, &.kabobs {
                    &::before  {
                        content: "";
                        display: block;
                        width: 0px; height: 0;
                        border-left: 15px solid transparent;
                        border-right: 15px solid transparent;
                        border-bottom: 15px solid #9fdfff;
                        transition: transform 700ms ease, opacity 900ms ease;
                        transition: .35s cubic-bezier(.54,1.60,.5,1);   
                        position: absolute;
                        bottom: 0;
                        @media (max-width: 991px) {
                            border-top: 15px solid transparent;
                            border-bottom: 15px solid transparent;
                            border-right: 15px solid #9fdfff;
                            right: 0; top: 0; bottom: 0;
                            margin: auto;
                        }
                    }
                } 
                &:hover {
                    background: #fff;
                    color: #9fdfff;
                    box-shadow: inset 4px -4px 0 4px #9fdfff;
                    @media (max-width: 991px) {
                        box-shadow: inset -4px 4px 0 4px #9fdfff !important;
                    }
                    span, i {
                        transform: translateY(0);
                        opacity: 1;
                        color: #1a8fe7;
                        background: linear-gradient(45deg, #9fdfff , #1a8fe7);
                        -webkit-background-clip: text;
                        -webkit-text-fill-color: transparent;
                    }
                    &::before  {
                        @media (max-width: 991px) { 
                            border-top-width: 450px ;
                            border-bottom-width: 450px;
                            border-right-width: 450px;
                            opacity: 0;
                        }
                        @media (min-width: 992px) { 
                            border-left-width: 450px ;
                            border-right-width: 450px;
                            border-bottom-width: 450px;
                            opacity: 0;
                        }
                    }
                }
            }
            .sub-menu {
                display: flex;
                flex-direction: column;
                position: absolute;
                width: 120%;
                transform: translateY(-300px);
                transition: transform 150ms ease;
                transition: .2s cubic-bezier(.94,1.60,.5,1);   
                @media (max-width: 991px) {
                    transform: translate(-20%, -234px);
                }
                .menu-item {
                    a {
                        background: #9fdfff;
                        font-size: 21px;
                        font-weight: 500;
                        height: 90px;
                        align-items: flex-start;
                        padding-left: 1.4em;
                        @media (max-width: 991px) {
                            border: 7px solid transparent;
                            border-left: 0;
                            border-bottom: 0;
                        }
                        @media (min-width: 992px) {
                            border: 7px solid transparent;
                            border-top: 0;
                            border-right: 0;
                        }
                        transition: all 110ms ease;
                        transition: .2s cubic-bezier(0.57, 0.21, 0.69, 3.25);
                        span {
                            transform: translateY(0);
                            opacity: 1;
                        }
                        &.item--b {
                            background: lighten(#9fdfff, 3);

                        }
                        &.item--c {
                            background: lighten(#9fdfff, 7);
                        }
                        &:hover {
                            background: #fff;
                            padding-left: 1.8em;
                            box-shadow: inset 4px -4px 0 4px #9fdfff; //,inset -4px -4px 0 4px #9fdfff;
                            @media (max-width: 991px) {
                            box-shadow: inset -4px 4px 0 4px #9fdfff;
                        }
                            border-color: #f1f1f1;
                            span {
                                color: #1a8fe7;
                                background: linear-gradient(45deg, #9fdfff , #1a8fe7);
                                -webkit-background-clip: text;
                                -webkit-text-fill-color: transparent;
                            }
                        }
                    }
                }
            }
            &:hover {
                .sub-menu {
                    transform: translateY(0);
                    @media (max-width: 991px) {
                        transform: translate(256px, -234px);
                    }
                    z-index: 99;
                }
            }
        }
    }
}
!

JS
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