/* grid container */
.holy-grail-grid {
    display:grid;
    grid-template-areas:
        'header'
        'main-content'
        'left-sidebar'
        'right-sidebar'
        'footer';
}

}


.sign-wrap-1 {
    background: #337AB7;
    text-align: center;
    padding: 60px 20px;
}
.sign-wrap-1 .sign_word {
    font-size: 40px;
    font-weight: bold;
    line-height: 50px;
    color: #FFF;
    font-family: 'Roboto', sans-serif;
    text-transform: uppercase;
    animation: neon-1 .1s ease-in-out infinite alternate;
}
@keyframes neon-1 {
    from {
        text-shadow: 0 0 6px rgba(202, 228, 225, 0.92), 0 0 30px rgba(202, 228, 225, 0.34), 0 0 12px rgba(191, 226, 255, 0.52), 0 0 21px rgba(191, 226, 255, 0.92), 0 0 34px rgba(191, 226, 255, 0.78), 0 0 54px rgba(191, 226, 255, 0.92);
    }
    to {
        text-shadow: 0 0 6px rgba(202, 228, 225, 0.98), 0 0 30px rgba(202, 228, 225, 0.42), 0 0 12px rgba(191, 226, 255, 0.58), 0 0 22px rgba(191, 226, 255, 0.84), 0 0 38px rgba(191, 226, 255, 0.88), 0 0 60px #FFF;
    }
}
.nav flex-column{
    background: white;
}
.info-text{
    background: white;
}
.nav-item li a{
    
    font-size: 25px;
    color:white;
}
.nav flex-column{
    color:black;
}
.nav-link{
    color: black;
}

/* general column padding */
.holy-grail-grid > * {
    padding:1rem;
}

/* assign columns to grid areas */
.holy-grail-grid > .header {
    grid-area:header;
  /* background:#333;*/
  background-image: url('/assets/123.jpg');
   background-size: cover;
}
.holy-grail-grid > .main-content {
    grid-area:main-content;
    background:#D3D3D3;
}
.holy-grail-grid > .left-sidebar {
    grid-area:left-sidebar;
    background: #D3D3D3;

}
.holy-grail-grid > .right-sidebar {
    grid-area:right-sidebar;
      background: #D3D3D3;
}
.holy-grail-grid > .footer {
    grid-area:footer;
    background:#fbfbfb;
}

/* tablet breakpoint */
@media (min-width:768px) {
    .holy-grail-grid {
        grid-template-columns: 1fr 1fr;
        grid-template-areas:
            'header header'
            'main-content main-content'
            'left-sidebar right-sidebar'
            'footer footer';
    }
}

/* desktop breakpoint */
@media (min-width:1024px) {
    .holy-grail-grid {
        grid-template-columns: repeat(4, 1fr);
        grid-template-areas:
            'header header header header'
            'left-sidebar main-content main-content right-sidebar'
            'footer footer footer footer';
    }
}
/* меню */

CSS:
Стили кнопки "подробнее" взяты из темы: «Оформление кнопок на CSS». При желании можно выбрать другие или использовать свои.

.grid * {
	box-sizing: border-box;
}
.grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
	column-gap: 30px;
	row-gap: 30px;
	padding: 20px 0;
}
.grid-item {
	box-shadow: 0 2px 5px rgba(0,0,0,0.2), 0 4px 6px rgba(0,0,0,0.2);
	transition: box-shadow .3s;
	width: 100%;
	height: 100%;  
	border-radius: 8px;
	overflow: hidden;
	background: white;
}
.grid-item .image {
	height: 200px;
	overflow: hidden;
}
.grid-item .info {
	position: relative;
	height: calc(100% - 200px);
	padding: 16px 14px 70px 14px;
}
.grid-item:hover {
	box-shadow: 0 4px 12px rgba(0,0,0,0.2), 0 16px 20px rgba(0,0,0,0.2);
}
.grid-item .image img  {
  	transition: transform 280ms ease-in-out;
	display: block;
	width: 100%;
	height: 100%;
	object-fit: cover;	
}
.grid-item:hover .image img  {
	transform: scale(1.1);
}
.info h2 {
	color: #337AB7;
	font-size: 20px;
	font-weight: normal;
	margin: 0;
	text-align: center;
}
.info-text p {
	font-size: 16px;
	line-height: 20px;
	margin-bottom: 10px;
}
.info-text p:last-child {
	margin-bottom: 0;
}
.grid-item .button-wrap {
	display: block;
	width: 100%;
	position: absolute;
	bottom: 14px;
	left: 0;
	text-align: center;
}
/* Кнопка подробнее */
.atuin-btn {
	display: inline-flex;
	text-decoration: none;
	position: relative;
	font-size: 16px;
	line-height: 20px;
	padding: 8px 30px;
	color: #FFF;
	font-weight: bold;
	text-transform: uppercase; 
	background: #337AB7;
	cursor: pointer; 
	border: 2px solid #BFE2FF;
	border-radius: 8px;	
}
.atuin-btn:hover,
.atuin-btn:active,
.atuin-btn:focus {
	color: #FFF;
}
.atuin-btn:after,
.atuin-btn:before {
	position: absolute;
	height: 4px;
	left: 50%;
	background: #337AB7;
	bottom: -6px;
	content: "";
	transition: all 280ms ease-in-out;
	width: 0;
}
.atuin-btn:before {
	top: -6px;
}
.atuin-btn:hover:after,
.atuin-btn:hover:before,
.atuin-btn:active:after,
.atuin-btn:active:before,
.atuin-btn:focus:after,
.atuin-btn:focus:before {
	width: 100%;
	left: 0;
}
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.grid * {
    box-sizing: border-box;
}
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
    column-gap: 30px;
    row-gap: 30px;
    padding: 20px 0;
}
.grid-item {
    box-shadow: 0 2px 5px rgba(0,0,0,0.2), 0 4px 6px rgba(0,0,0,0.2);
    transition: box-shadow .3s;
    width: 100%;
    height: 100%;  
    border-radius: 8px;
    overflow: hidden;
}
.grid-item .image {
    height: 200px;
    overflow: hidden;
}
.grid-item .info {
    position: relative;
    height: calc(100% - 200px);
    padding: 16px 14px 70px 14px;
}
.grid-item:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.2), 0 16px 20px rgba(0,0,0,0.2);
}
.grid-item .image img  {
      transition: transform 280ms ease-in-out;
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;    
}
.grid-item:hover .image img  {
    transform: scale(1.1);
}
.info h2 {
    color: #337AB7;
    font-size: 20px;
    font-weight: normal;
    margin: 0;
    text-align: center;
}
.info-text p {
    font-size: 16px;
    line-height: 20px;
    margin-bottom: 10px;
}
.info-text p:last-child {
    margin-bottom: 0;
}
.grid-item .button-wrap {
    display: block;
    width: 100%;
    position: absolute;
    bottom: 14px;
    left: 0;
    text-align: center;
}
/* Кнопка подробнее */
.atuin-btn {
    display: inline-flex;
    text-decoration: none;
    position: relative;
    font-size: 16px;
    line-height: 20px;
    padding: 8px 30px;
    color: #FFF;
    font-weight: bold;
    text-transform: uppercase; 
    background: #337AB7;
    cursor: pointer; 
    border: 2px solid #BFE2FF;
    border-radius: 8px;    
}
.atuin-btn:hover,
.atuin-btn:active,
.atuin-btn:focus {
    color: #FFF;
}
.atuin-btn:after,
.atuin-btn:before {
    position: absolute;
    height: 4px;
    left: 50%;
    background: #337AB7;
    bottom: -6px;
    content: "";
    transition: all 280ms ease-in-out;
    width: 0;
}
.atuin-btn:before {
    top: -6px;
}
.atuin-btn:hover:after,
.atuin-btn:hover:before,
.atuin-btn:active:after,
.atuin-btn:active:before,
.atuin-btn:focus:after,
.atuin-btn:focus:before {
    width: 100%;
    left: 0;
}
.resp-tab {
    border-radius: 5px;
    font-weight: normal;
    border: none;
    border-collapse: collapse;
    width: 100%;
    max-width: 100%;
}
.resp-tab th, .resp-tab td {
    padding: 10px 20px;
    font-size: 13px;
    border: none;
    font-family: Verdana, sans-serif;    
    border: 1px solid #337AB7;
    vertical-align: top;
}
.resp-tab th {
    color: #FFF;
    background: #337AB7;
    font-weight: bold;
    border: 1px solid #1a4a73;    
    text-transform: uppercase;    
    text-align: center;    
}
.resp-tab tr:nth-child(even) {
    background: #edf7ff;
}
.resp-tab td span {
    background: #337AB7;
    color: #FFF;
    display: none;
    font-size: 11px;
    font-weight: bold;
    font-family: Verdana, sans-serif;    
    text-transform: uppercase;        
    padding: 5px 10px;
    position: absolute;
    top: 0;
    left: 0;    
}
@media(max-width: 768px) {
    .resp-tab thead {
        display: none;
    }
    .resp-tab tr {
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
        margin-bottom: 30px;
    }
    .resp-tab td {
        margin: 0 -1px -1px 0;
        padding-top: 35px;
        position: relative;
        width: 50%;
    }
    .resp-tab td span {
        display: block;
    }
}
@media(max-width: 480px) {
    .resp-tab td {
        width: 100%;
    }
}
/* менюшка*/
@import url('https://fonts.googleapis.com/css?family=Ubuntu+Condensed');
.menu-main {
  list-style: none;
  margin: 40px 0 5px;
  padding: 25px 0 5px;
  text-align: center;
/*  background: #333;*/
}
.menu-main li {display: inline-block;}
.menu-main li:after {
  
  color: white;
  display: inline-block;
  vertical-align:top;
}
.menu-main li:last-child:after {content: none;}
.menu-main a {
  text-decoration: none;
  font-family: 'Ubuntu Condensed', sans-serif;
  letter-spacing: 2px;
  position: relative;
  padding-bottom: 20px;
  margin: 0 34px 0 30px;
  font-size: 17px;
  text-transform: uppercase;
  display: inline-block;
  transition: color .2s;
}
.menu-main a, .menu-main a:visited {color: #9d999d;}
.menu-main a.current, .menu-main a:hover{color: white;}
.menu-main a:before,
.menu-main a:after {
  content: "";
  position: absolute;
  height: 4px;
  top: auto;
  right: 50%;
  bottom: -5px;
  left: 50%;
  background: blue;
  transition: .8s;
}
.menu-main a:hover:before, .menu-main .current:before {left: 0;}
.menu-main a:hover:after, .menu-main .current:after {right: 0;}   
@media (max-width: 550px) {
.menu-main {padding-top: 0;}
.menu-main li {display: block;}
.menu-main li:after {content: none;}
.menu-main a {
  padding: 25px 0 20px; 
  margin: 0 30px;
}
}