Onde está o erro nesse scss?

.flip-container {
    perspective: 1000px;
    height: 100%;
    @include addEase();

    &.hover,
    &:hover{
        .flipper {
            transform: rotateY(180deg);
        }
    }

    &.front,
    &.like-card{
        .flipper {
            transform: rotateY(0deg);
        }
    }

    &.card-flip{
        .flipper{
            @extend .card-shadow;
        }
    }

    @include md-down{
        .flipper {
            transform: rotateY(180deg);
        }
    }

    .flipper {
        transition: 0.4s;
        transform-style: preserve-3d;
        position: relative;
        height: 100%;

        .flip-item{
            width: 100%;
            backface-visibility: hidden;
            position: absolute;
            top: 0;
            left: 0;
            background: #FFF;

            &.front {
                z-index: 2;
                transform: rotateY(0deg);
            }

            &.back {
                transform: rotateY(180deg);
            }

            .info-detail,
            .container-info{
                flex-direction: column;
                div{
                    padding: 0;
                }
            }

            .score{ 
                margin:auto 1rem 1rem auto;
            }

            .bg-xpert{
                height: 100px;
                display: flex;
                img{
                    margin:auto auto -60px;
                    width: 125px;
                    border-radius: 50%;
                }
            }
            .xpert-name{
                text-align: center;
            }

            .container-list {
                display: none;
            }

            .container-btn{
                width: 100%;
                justify-content: center;
            }

            @include md-up{
                .container-md-list {
                    display: none;
                }
                .container-md-grid {
                    display: block;
                }
                .score{ 
                    text-align: right;
                }
            }

        }
    }
}