.materials {
    padding: 100px 0 80px;
}

.materials__link {
    display: block;
    position: relative;
    font-size: 0;
    height: 100%;
    overflow: hidden;
}

@media (min-width: 990px) {
    .materials__link:hover .materials__inner {
        opacity: 1;
    }
    
    .materials__link:hover .materials__bottom {
        opacity: 0;
        -webkit-transform: translateY(-50px);
                transform: translateY(-50px);
    }
}

.materials__link:before {
    content: "";
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: linear-gradient(to bottom, transparent, rgba(0,0,0, 0.6));
    opacity: 1;
    z-index: 1;
}

.materials__link img {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    -o-object-fit: cover;
       object-fit: cover;
    -o-object-position: center;
       object-position: center;
    -webkit-transform: scale(1);
            transform: scale(1);
    transition: -webkit-transform 0.3s ease-in-out;
    transition: transform 0.3s ease-in-out;
    transition: transform 0.3s ease-in-out, -webkit-transform 0.3s ease-in-out;
}

.materials__list {
    margin-top: 35px;
}

.materials__item {
    margin-bottom: 32px;
    min-height: 237px;
}

.materials__content {
    height: 100%;
}

.materials__inner {
    position: relative;
    z-index: 2;
    padding: 36px 24px;
    text-align: center;
    background-color: rgba(4, 51, 100, 0.9);
    opacity: 0;
    transition: opacity 0.2s ease-in-out;
    z-index: 2;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.materials__title {
    font-size: 30px;
    font-weight: bold;
    color: #FFF;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.materials__description {
    color: #FFF;
}

.materials__description p {
    font-size: 17px;
    font-weight: normal;
    line-height: 1.4;
}

.materials__description span {
    display: inline-block;
    margin-top: 10px;
    font-family: 'Rajdhani', sans-serif;
    font-size: 18px;
    font-weight: bold;
}

.materials__description span:after {
    content: "";
    display: inline-block;
    vertical-align: middle;
    width: 0;
    height: 0;
    position: relative;
    top: -2px;
    margin-left: 8px;
    border-top: 7px solid transparent;
    border-right: 0;
    border-bottom: 7px solid transparent;
    border-left: 7px solid white;
}

.materials__bottom {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 10px 24px;
    text-align: center;
    z-index: 1;
    -webkit-transform: translateY(0);
            transform: translateY(0);
    opacity: 1;
    transition: opacity 0.2s ease-in-out,
                -webkit-transform 0.3s ease-in-out;
    transition: transform 0.3s ease-in-out,
                opacity 0.2s ease-in-out;
    transition: transform 0.3s ease-in-out,
                opacity 0.2s ease-in-out,
                -webkit-transform 0.3s ease-in-out;
}

/*
* Responsive
*/

@media (max-width: 1025px) {
    .materials {
        padding-bottom: 40px;
    }

    .materials__upper {
        padding: 0 20px;
    }

    .materials__title {
        font-size: 25px;
    }

    .materials__description {
        font-size: 17px;
    }

    .materials__description span {
        font-size: 18px;
    }
}

@media (max-width: 600px) {
    .materials {
        padding-top: 60px;
    }

    .materials__upper {
        padding: 0;
        margin: 0;
        text-align: center;
        width: 100%;
        display: block;
    }

    .materials__button {
        margin-top: 5px;
        text-align: center;
    }

    .materials__item {
        min-height: auto;
    }

    .materials__inner {
        display: none;
    }

    .materials__link:before {
        background-image: none;
        background-color: #4A4A4A;
        opacity: 0.6;
    }

    .materials__title {
        margin-bottom: 0;
    }

    .materials__bottom {
        position: relative;
        top: 0;
        -webkit-transform: none;
                transform: none;
        padding: 30px 20px;
        min-height: 100px;
        display: flex;
        justify-content: center;
        text-align: center;
        align-items: center;
    }
}