.slider{
    position: relative;
    width: 80%;
    height: 80%;
    overflow: hidden;
}

.item{
    position: absolute;
    width: 30%;
    height: 80%;
    text-align: justify;
    background-color: #fff;
    border-radius: 20px;
    padding: 20px;
    transition: 0.5s;
    transform: translate(-50%, 0);
    left: 50%;
    top: 7%;
}

.item > h1{
    position: relative;
    font-size: 2rem;
    font-weight: bold;
}

.item > h1::before{
    content: "";
    position: absolute;
    width: 100%;
    height: 3px;
    bottom: -10px;
    background-color: gray;
    transition: 0.5s linear;
    transform: scale(1);
}

#next, #prev{
    position: absolute;
    top: 40%;
    color: #fff;
    background-color: transparent;
    border: none;
    font-size: 4rem;
    font-family: monospace;
    font-weight: bold;
    left: 10%;
    text-shadow: 2px 2px 20px #fc6a50;
    animation: color 2s linear infinite;
    z-index: 8;
}

#next{
    left: unset;
    right: 10%;
}

.rule_chose_area{
    width: 50%;
    display: flex;
    justify-content: space-evenly;
    text-align: center;
}

.rule_chose_area > h3{
    position: relative;
    color: #F1F6F9;
    padding: 10px;
    user-select: none;
    background-color: rgba(0, 0, 0, 0.3);
    opacity: 0.8;
    transition: 0.5s linear;
}

.rule_chose_area > h3.active{
    background-color: rgba(252, 106, 80, 0.8);
    transition: 0.5s linear;
    opacity: 1;
}

.rule_chose_area > h3:hover{
    opacity: 1;
}

.rule_chose_area > h3::before{
    position: absolute;
    content: "";
    height: 2px;
    width: 100%;
    background-color: #fc6a50;
    bottom: 0;
    left: 0;
    transform: scaleX(0);
    transition: 0.3s linear;
}

.rule_chose_area > h3:hover::before{
    content: "";
    transform: scaleX(1);
}

.item > div{
    overflow-y: scroll;
    height: 80%;
    line-height: 1.7rem;
}

@keyframes item_active{
    0%{
        box-shadow: 0px 0px 30px #fc6a50;
    }
    50%{
        box-shadow: 0px 0px 0px #fc6a50;
    }
    100%{
        box-shadow: 0px 0px 30px #fc6a50;
    }
}

@media only screen and (max-width: 768px) {
    .slider{
        width: 95%;
        height: 90%;
    }
    .item{
        width: 65%;
        height: 70%;
    }
    .item > h1{
        font-size: 1.7rem;
    }
    #prev{
        left: 0;
    }
    #next{
        right: 0;
    }
    .rule_chose_area{
        width: 100%;
    }
}