:root {
    --main-bg-color: #262d36;
    --main-text-color: #ffffff;
    --green-color: rgb(0, 255, 0);
}

html, body {
    height: 100%
}

.wrapper {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 100%;
    position: relative;
}

.content {
    display: flex;
    min-height: 100%;
    flex-direction: column;
    flex-grow: 1;
}
header, footer {
    background-color: var(--main-bg-color);
    color: var(--main-text-color);
}

header .logo img {
    width: 250px;
    padding: 10px 0;
}

header .menu nav {
    height: 100%;
}

header .menu nav ul {
    list-style: none;
    height: 100%;
    margin: 0;
    display: flex;
    justify-content: flex-end;
}

header .menu nav ul li {
    height: 100%;
    display: block;
}
header .menu nav ul li .active {
    color: rgb(0, 255, 0);
    border-bottom: 2px solid var(--green-color);
}

header .menu nav ul li a {
    border-bottom: 2px solid transparent;
    height: 100%;
    display: flex;
    align-items: center;
    margin-left: 10px;
    text-decoration: none;
    font-weight: 600;
    color: #FFFFFF;
}

header .menu nav ul li a:hover {
    color: rgb(0, 255, 0);
    border-bottom: 2px solid var(--green-color);
}
.content .title {
    height: 640px;
    background-image: url("../images/banner-4.jpg");
    background-size: cover;
    background-repeat: no-repeat;
    color: #FFFFFF;
}
footer {
    padding: 30px 0;
}
.content .title h1 {
    color: var(--green-color);
    padding: 15px;
    font-size: 3.5rem;
    text-shadow: 0 0 10px rgba(0, 0, 0, 1);
}

.content .title h2 {
    padding: 15px;
    font-size: 1.5rem;
    font-weight: lighter;
    text-shadow: 0 0 10px rgba(0, 0, 0, 1);
}
.content .title .shadow {
    background-color: rgba(0, 0, 0, 0.7);
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.content .about {
    background-color: var(--main-bg-color);
    color: #ffffff;
    padding: 30px 0;
}
.content .about .about-inner {
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.content .about .about-intro {
    font-size: 2rem;
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px dotted #ccc;
}
.content .about .about-list {
    font-size: 1.2rem;
}
.content .about .about-image img {
    width: 70%;
    height: auto;
    border-radius: 15px;
    -webkit-box-shadow: 0 0 55px 5px rgba(0,0,0,.5);
    box-shadow: 0 0 55px 5px rgba(0,0,0,.5);
}

.content .certificates {
    padding: 30px 0;
}

.content .certificates .certificate-item .certificate-item-inner {
    box-shadow: 0 0 30px rgba(0, 0, 0, .5);
    border-radius: 5px;
    background-color: #FFFFFF;
    margin: 30px 0;
    transition-duration: 600ms;
    height: 450px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.content .certificates .certificate-item .certificate-item-inner {
    box-shadow: 0 0 30px rgba(0, 0, 0, .5);
    border-radius: 5px;
    background-color: #FFFFFF;
    margin: 30px 0;
    transition-duration: 600ms;
    height: 450px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.content .certificates .certificate-item .certificate-item-inner-gb {
    height: 360px;
}

.content .certificates .certificate-item .certificate-item-inner:hover {
    box-shadow: 0 0 80px rgba(0, 0, 0, .5);
}

.content .certificates .certificate-item .certificate-item-inner .certificate-item-image {
    border-radius: 5px;
    overflow: hidden;
}
.content .certificates .certificate-item .certificate-item-inner .certificate-item-image img {
    width: 100%;
    cursor: pointer;
}

.content .certificates .certificate-item .certificate-item-inner .certificate-item-vendor {
    padding-top: 15px;
}
.content .certificates .certificate-item .certificate-item-inner .certificate-item-title {
    font-weight: bolder;
    padding: 15px 0;
}
.content .tasks {
    border: 1px solid blue;
    color: #ffffff;
    background-color: var(--main-bg-color);
    padding: 30px 0;
}

.content .tasks .task-item-inner {
    margin: 15px 0;
}
.content .tasks .task-item-inner h3 {
    font-size: 1.5rem;
    padding-bottom: 5px;
    border-bottom: 1px dotted #cccccc;
}

.content .contacts {
    padding: 30px 0;
}
.content .contacts .contacts-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 15px 0;
}

.content .contacts .contacts-inner img {
    width: 50px;
    height: auto;
    margin-bottom: 10px;
}

.content .contacts .contacts-inner a {
    text-decoration: none;
    font-size: 1.5rem;
    color: var(--main-bg-color);;
}