Почему не работает флекс?

.clocks {
    width: 860px;
    display: flex;
    justify-content: flex-start;
}

.clock-card {
    width: 250px;
    height: 300px;
    margin-right: 40px;
    padding: 20px;
    background-color: #FDFDFB;
    padding-top: 20px;
    position: relative;
    cursor: pointer;
    text-align: center;
    margin-bottom: 40px;
    &__banner {
        & .banner-title {
            opacity: 0;
        }
    }
    & .card-img {
        max-width: 250px;
        max-height: 300px;
        position: absolute;
        top: 0;
        left: 0;
        z-index: 1;
    }
    &:nth-child(3n) {
        margin-right: 0;
    }
    & .card-title {
        @include font-family-normal;
        font-weight: bold;
        line-height: 21px;
        letter-spacing: 0.05em;
        color: #444240;
        margin-top: 0;
        margin-bottom: 9px;
        text-align: left;
        z-index: 10;
    }
    & .card-price {
        @include font-family-normal;
        line-height: 16px;
        color: #636261;
        margin-top: 0;
        margin-bottom: 0;
        z-index: 10;
        text-align: left;
    }
}

.card-icons{
    position: absolute;
    right: 20px;
    top: 20px;
    z-index: 10;
    & .add-card-favorites {
        background-image: url(../img/heart.svg);
        right: 55px;
        &:hover {
            background-image: url(../img/heart_active.svg); 
            filter: none;
        }
        &__active {
            background-image: url(../img/heart_active.svg); 
        }
    }
    & .add-card-basket {
        background-image: url(../img/basket.svg);
        right: 20px;
    }
    & .card-icon{
        width: 25px;
        height: 25px;
        background-repeat: no-repeat;
        background-color: transparent;
        border: none;
        background-position: center;
        cursor: pointer;
        outline: none;
        z-index: 10;
        &:hover {
            filter: drop-shadow(0px 4px 4px rgba(0, 0, 0, 0.5));
        }
    }
}
                <div class="сlocks">
                    <a href="" class="clock-card">
                        <div class="card-icons">
                            <button class="add-card-favorites card-icon" data-id="card-1"></button>
                            <button class="add-card-basket card-icon"></button>
                        </div>
                        <h2 class="card-title">
                            TECHNE
                        </h2>
                        <p class="card-price">
                            22 700 &#8381
                        </p>
                        <img class="card-img" src="img/watch_1.png" alt="">
                    </a>
                    <a href="" class="clock-card">
                        <div class="card-icons">
                            <button class="add-card-favorites card-icon" data-id="card-2"></button>
                            <button class="add-card-basket card-icon"></button>
                        </div>
                        <h2 class="card-title">
                            TECHNE
                        </h2>
                        <p class="card-price">
                            22 700 &#8381
                        </p>
                        <img class="card-img" src="img/watch_2.png" alt="">
                    </a>
                    <a href="" class="clock-card">
                        <div class="card-icons">
                            <button class="add-card-favorites card-icon" data-id="card-3"></button>
                            <button class="add-card-basket card-icon"></button>
                        </div>
                        <h2 class="card-title">
                            TECHNE
                        </h2>
                        <p class="card-price">
                            22 700 &#8381
                        </p>
                        <img class="card-img" src="img/watch_3.png" alt="">
                    </a>
                    <a href="" class="clock-card">
                        <div class="card-icons">
                            <button class="add-card-favorites card-icon"></button>
                            <button class="add-card-basket card-icon"></button>
                        </div>
                        <h2 class="card-title">
                            TECHNE
                        </h2>
                        <p class="card-price">
                            22 700 &#8381
                        </p>
                        <img class="card-img" src="img/watch_4.png" alt="">
                    </a>
                    <a href="" class="clock-card">
                        <div class="card-icons">
                            <button class="add-card-favorites  add-card-favorites__active card-icon"></button>
                            <button class="add-card-basket card-icon"></button>
                        </div>
                        <h2 class="card-title">
                            TECHNE
                        </h2>
                        <p class="card-price">
                            22 700 &#8381
                        </p>
                        <img class="card-img" src="img/watch_5.png" alt="">
                    </a>
                    <a href="" class="clock-card">
                        <h2>
                            TECHNE
                        </h2>
                        <img class="card-img" src="img/banner_catalog.png" alt="">
                    </a>
                    <a href="" class="clock-card">
                        <div class="card-icons">
                            <button class="add-card-favorites card-icon"></button>
                            <button class="add-card-basket card-icon"></button>
                        </div>
                        <h2 class="card-title">
                            TECHNE
                        </h2>
                        <p class="card-price">
                            22 700 &#8381
                        </p>
                        <img class="card-img" src="img/watch_6.png" alt="">
                    </a>
                    <a href="" class="clock-card">
                        <div class="card-icons">
                            <button class="add-card-favorites card-icon"></button>
                            <button class="add-card-basket card-icon"></button>
                        </div>
                        <h2 class="card-title">
                            TECHNE
                        </h2>
                        <p class="card-price">
                            22 700 &#8381
                        </p>
                        <img class="card-img" src="img/watch_7.png" alt="">
                    </a>
                    <a href="" class="clock-card">
                        <div class="card-icons">
                            <button class="add-card-favorites card-icon"></button>
                            <button class="add-card-basket card-icon"></button>
                        </div>
                        <h2 class="card-title">
                            TECHNE
                        </h2>
                        <p class="card-price">
                            22 700 &#8381
                        </p>
                        <img class="card-img" src="img/watch_8.png" alt="">
                    </a>
                    <a href="" class="clock-card">
                        <div class="card-icons">
                            <button class="add-card-favorites card-icon"></button>
                            <button class="add-card-basket card-icon"></button>
                        </div>
                        <h2 class="card-title">
                            TECHNE
                        </h2>
                        <p class="card-price">
                            22 700 &#8381
                        </p>
                        <img class="card-img" src="img/watch_9.png" alt="">
                    </a>
                    <a href="" class="clock-card">
                        <div class="card-icons">
                            <button class="add-card-favorites card-icon"></button>
                            <button class="add-card-basket card-icon"></button>
                        </div>
                        <h2 class="card-title">
                            TECHNE
                        </h2>
                        <p class="card-price">
                            22 700 &#8381
                        </p>
                        <img class="card-img" src="img/watch_10.png" alt="">
                    </a>
                    <a href="" class="clock-card">
                        <div class="card-icons">
                            <button class="add-card-favorites card-icon"></button>
                            <button class="add-card-basket card-icon"></button>
                        </div>
                        <h2 class="card-title">
                            TECHNE
                        </h2>
                        <p class="card-price">
                            22 700 &#8381
                        </p>
                        <img class="card-img" src="img/watch_11.png" alt="">
                    </a>
                </div>


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