*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

ul{
    list-style-type: none;
}

a{
    text-decoration-line: none;
}

.container{
    width: 350px;
    height: 300px;
}

.middle{
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
}

.front,.back{
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 5px;
    backface-visibility: hidden;
    transition: .6s ease;
}

.front{
    background-color: blue;
    color: aliceblue;
    padding: 30px;
    transform: rotateY(180deg);
}

.front a{
    color: aliceblue;
}

.front:before{
    content: '';
    width: 30%;
    height: 100%;
    border-radius: 5px;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
    position: absolute;
    right: 0;
    top: 0;
    clip-path: polygon(100% 0,0 0,50% 50%,0 100%,100% 100%);
    background-color: red;
}

.front h3{
    padding-bottom: 15px;
    font-size: 24px;
    letter-spacing: 8px;
}

.front span{
    display: block;
    padding: 0 0 30px 15px;
}

.front ul li{
    display: flex;
    position: relative;
    align-items: center;
    margin-bottom: 15px;
    z-index: 1;
}

.back{
    background-color: rgba(0,0,0,.7);
    color: aliceblue;
    letter-spacing: 15px;
    font-size: 24px;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
}


.container:hover .front{
    transform: rotateY(0);
}

.container:hover .back{
    transform: rotateY(-180deg);
}