@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300&display=swap');
    * {
        margin: 0;
        padding: 0;
        color: var(--secondary);
        font-size: 16px;
        font-family: 'Roboto', sans-serif;
        box-sizing: border-box;
        text-decoration: none;
    }
    
    html,
    body {
        scroll-behavior: smooth;
    }
    
    body {
        background-color: var(--primary);
    }
    
    body.on {
        overflow: hidden !important;
    }
    
    .main {
        height: 100vh;
    }
    
    .scroll-down {
        display: flex;
        justify-content: center;
        margin-top: 50px;
        animation: scrolldown 1s infinite;
    }
    
    .scroll-down i {
        font-size: 24px;
    }
    /* navbar */
    
    .navbar {
        background-color: #282c34;
        padding: 10px 15px;
        position: relative;
    }
    
    .navbar-nav {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    .navs {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 50px;
        left: 0;
        right: 0;
        background-color: #282c34;
        z-index: 10;
    }
    
    .navs-item {
        padding: 10px 15px;
        text-align: center;
    }
    
    .navs-item a {
        color: white;
        text-decoration: none;
    }
    
    .navs-item a:hover {
        color: #61dafb;
    }
    
    .navbar-toggler {
        display: block;
        cursor: pointer;
        color: white;
    }
    
    .navbar-brand {
        display: flex;
        align-items: center;
    }
    
    .navbar-brand-txt a {
        font-size: 24px;
        letter-spacing: 1px;
    }
    
    .navs {
        display: flex;
        align-items: center;
        flex-direction: column;
        width: 100%;
    }
    
    .navs .navs-item {
        margin: 0px 10px;
        padding: 10px;
        font-weight: bold;
        width: 100%;
        text-align: center;
    }
    
    .navs .navs-item a {
        font-size: 14px;
        color: var(--secondary-disabled);
    }
    
    .navs .navs-item a:hover {
        color: var(--secondary);
    }
    
    .navs .navs-item a button {
        font-size: 14px;
    }
    
    .navs .navs-item.notbtn {
        margin: 0px 10px;
        transition: 0.3s;
        padding: 10px;
        border-radius: 4px;
        cursor: pointer;
    }
    
    .navs .navs-item.notbtn:hover {
        /*transform: scale(1.1);*/
        font-weight: bold;
        background-color: rgb(0, 0, 0, 0.3);
    }
    
    .navs .navs-item.notbtn:focus {
        /*transform: scale(1.1);*/
        font-weight: bold;
        background-color: rgb(0, 0, 0, 0.1);
        border-radius: 4px;
    }
    
    .navs-item .btn {
        font-weight: bold;
    }
    /* navbar end */
    
    .btn {
        border: none;
        background-color: var(--third);
        padding: 10px 30px;
        border-radius: 4px;
        cursor: pointer;
        transition: 0.2s;
    }
    
    .btn:hover {
        background-color: var(--third-disabled);
    }
    
    .btn.blue {
        background-color: var(--o1);
    }
    
    .btn.blue:hover {
        background-color: var(--o1-disabled);
    }
    /* jumbotron */
    
    .jumbotron {
        margin-top: 100px;
    }
    
    .jumbotron-items {
        display: flex;
        justify-content: space-between;
    }
    
    .jumbotron-items .jumbotron-item {
        max-width: 450px;
    }
    
    .jumbotron-items .jumbotron-item img {
        width: 300px;
        height: auto;
    }
    
    .jumbotron-item .jumbotron-t {
        font-size: 30px;
        font-weight: bold;
        text-align: right;
        width: 100%;
    }
    
    .jumbotron-item .jumbotron-d {
        margin-top: 15px;
        font-size: 20px;
        color: var(--secondary-disabled);
    }
    
    .jumbotron-item .jumbotron-buttons {
        margin-top: 30px;
    }
    
    .jumbotron-item .jumbotron-buttons button {
        margin: 10px 5px;
    }
    /* jumbotron end */
    /* mobile */
    
    @media (max-width: 992px) {
        /* navbar mobile version */
        .navbar-toggler {
            display: block;
        }
        .navs {
            transform: translateX(110%);
            position: fixed;
            top: 0;
            bottom: 0;
            right: 0;
            left: 0;
            transition: 1s;
            justify-content: center;
            align-items: center;
        }
        .navs.on {
            transform: translateX(0%);
        }
        .navs .navs-item {
            width: 100%;
            text-align: center;
            margin: 10px 0px;
        }
        .navs-item a button {
            width: 100%;
        }
        .jumbotron-items {
            justify-content: center;
        }
        .jumbotron-items .jumbotron-item {
            text-align: center;
        }
        .jumbotron-items .jumbotron-item img {
            display: none;
        }
        /* navbar mobile version end */
    }
    
    @media (min-width: 768px) {
        .navbar-toggler {
            display: none;
        }
        .navs {
            display: flex;
            flex-direction: row;
        }
    }