html, body{
    padding: 0;
    margin: 0;

    width: 100%;
    height: 100%;
    overflow: hidden;
}

.main{
    flex: 1;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: stretch;
}
.container .btn-item{
    flex: 1;
    margin: 4px;
    border-radius: 7px;
    background-size: cover;
    background-repeat: no-repeat;
    position: relative;
    overflow: hidden;
    box-shadow: 2px 2px 5px rgb(60, 60, 60);
}

.container .btn-item .content{
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2;
    padding: 10px 20px;
    background-color: rgba(0, 0, 0, 0.4);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.btn-item .title{
    font-size: 3rem;
    color: white;
    font-weight: bold;
}

.btn-item .sub-text{
    transition: all 0.3s;
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
}

.btn-item .sub-text-1{
    text-align: left;
    transform: translateX(100%);
}
.btn-item .sub-text-2{
    text-align: right;
    transform: translateX(-100%);
}
.load .btn-item .sub-text-1,
.load .btn-item .sub-text-2{
    transform: translateX(0);
}

#item-article{
    text-align: right;
}

#prop-bg{
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: center;
    align-items: stretch;
}

#prop-bg .skew{
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    transform: skew(-15deg);
    position: relative;
}

#prop-bg .skew:nth-child(1){
    overflow: visible;
    z-index: 0;
}
#prop-bg .skew:nth-child(2){
    overflow: hidden;
    border-left: 2px solid white;
    border-right: 2px solid white;
    z-index: 1;
}
#prop-bg .skew:nth-child(3){
    overflow: visible;
    z-index: 0;
}

#prop-bg .skew div{
    height: 100%;
    width: 200%;
    background-size: cover;
    background-position: 50%;
    transform: skew(15deg) scale(1.6);
}