.filter{
    margin: 0 auto;
    width: 100%;

}
.filter select {
    padding: 10px 20px;
    outline: none;
    border: 2px solid wheat;
    font-size: 1rem;
    background: transparent;
    color: white;
    width: 100%;
    

}
.filter option{
    border-bottom: 2px solid white;
    background:#000;
    padding: 10px 20px;
    font-size: 1rem;
    width: 50%;
}

.cards{
    position: relative;
    width: 100%;
    border: 2px solid white;
    border-radius: 2PX;
    box-shadow: 1px 1px 15px #666;
    margin: 10px auto;
    padding: 5px;
    display: flex;
    flex-direction: row;
    transition: 1s;
}
.cards:hover{
    transform: scale(1.05);
}
.cards img{
width: 40%;
height: auto;
}

.cards span{
  position: absolute;
  top: 8px;
  left: 8px;
  background: #000;
  padding: 2px 5px;
  border-radius: 2px;
}
.cards .card-content{
padding: 0 5px;
}
.cards .card-content .card-heading{
    font-size: 1.0rem;
    line-height: 1.6;
    font-weight: 600;
}
.cards .card-content .card-no{
    font-size: 0.7rem;
    line-height: 1.6rem;
    font-style: italic;

}
.cards .card-content .author{
    color: #fff;
    line-height: 1.6;
}


/* ---------right-area ----------- */
.right-area .center-text{
    font-size: 1.05rem;
    justify-content: center;
    align-items: center;
    text-align: center;
    height: 200px;
    line-height: 1.5rem;
}
.right-area .heading{
    font-size: 2.0rem;
}

.right-area .abstract{
    text-align: justify;
    font-weight: normal;
}

.right-area li{
    display: block;
    padding-left: 20px;
    line-height: 1.6rem;
    font-size: 1.05rem;
}
.right-area .visit-link{
    padding: 10px;
    border: 1px solid gold;
    width: 100%;
    -webkit-animation: slide 1.5s forwards;
    -webkit-animation-delay: 2s;

}
.right-area .visit-link:hover{
    background-color: goldenrod;
    color: #fff;
    border: 1px solid white;
}