html, body{
    height: 100%;
    display: flex;
    flex-direction: column;
}
.wrap{
    flex-grow: 1;
}
img{
    width: 100%;
}
button{
    border: none;
    background: #FFF;
}
.banner{
    height: 14em;
    background: rgba(0, 0, 0, 0.8);
    position: relative;
}

.banner  h1{
   margin-top: 60px;
   text-align: center;
   padding: 40px;
   color: #FFF;
   font-size: 40px;
   letter-spacing: .1em;
}



.DistinctiveField{
    min-height: 60vh;
}

#Distinctive h1{
    display: block;
    text-align: center  ;
}
#Distinctive h5{
   text-align: left;
}

.sec{
    width: 100%;
}
/* .sec .title{
    text-align:center;
    padding: 20px;
} */
.b span{
    position: relative;
    left: 0;
}

.sec-item .txt{
    text-align: center;
    padding: 30px;
}
.sec-item .txt span{
    text-align: left;
    width: 100%;
}
.sec-item .txt span:hover{
    color: darkblue;
}
.sec-item .txt h1{
    padding: 10px;
    border-bottom: 1px solid;
    margin-bottom: 10%;
}
.sec-item .txt h4{
    text-align:initial;
    margin-bottom: 5%;
}
.sec-item a{
    color: black;
    text-decoration: none;
}
.sec-item .txt i{
    text-align: center;
    vertical-align: bottom;
    margin-left: 6px;
}
.sec-item .pic{
    padding: 20px;
    width: 100%;
}
.sec-item.introduce{
    display: none;
}
.introduce{
    margin-top: 2em;
    margin-bottom: 2em;
}
.introduce h1{
    margin-bottom: 1em;
}
.introduce ol{
    padding-left: 1rem;
}
.introduce li{
    margin-top: 1em;
}
.introduce button{
    width: 6em;
    height: 2em;
    border-radius: 5px;
    color: #FFF;
    background: #6684a7;
}
.introduce button:hover{
    background: #7d56b7;
}
.buttonclose{
    display: flex;
    justify-content: center;
}
.aboutus-item .txt h1{
    display: inline-block;
    padding: 30px;
    /* border-bottom: 3px solid; */
}
.aboutus-item .txt h3{
    text-align: center;
    margin-bottom: 20px;
}
 

.aboutus-card-item .txt{
    text-align: center;
    padding: 30px;
}
.aboutus-card-item .txt h1{
    padding: 10px;
    border-bottom: 1px solid;
    margin-bottom: 10%;
}
.aboutus-card-item .txt h4{
    text-align:left;
    margin-bottom: 5%;
}
.aboutus-card-item a{
    color: black;
    text-decoration: none;
    text-align: center;
}
.aboutus-card-item .txt i{
    text-align: center;
    vertical-align: bottom;
    margin-left: 6px;
}





@media screen and (min-width:768px){
    .DistinctiveField{
        min-height: 40vh;
    }
    .sec-item .txt , .thr-item .txt{
        text-align: left;
        /* padding: 30px; */
    }
    .sec-item .txt h1{
        padding: 10px;
        border-bottom: 1px solid;
        margin-bottom: 5%;
    }
    .aboutus-item .pic img{
        aspect-ratio: 4/3;
    }
    .aboutus-item .txt{
        width: 55%;
        display: flex;
        flex-direction: column;
        justify-content: space-evenly;
    }
    .grow{
        flex-grow: 1;
    }
    .aboutus-item .pic{
        margin-top: 30px;
        width: 45%;
    } 
    .aboutus-card-item{
        display: flex;
    }
}
@media screen and (min-width:992px){
    .DistinctiveField{
        min-height: 30vh;
    }
    .sec, .footers, .DistinctiveField{
        max-width: 1400px;
        margin: auto;
    }
    .sec-item{
        display: flex;
        justify-content: center;
    }
  
    #re{
        display: flex;
        flex-direction: row-reverse;
        justify-content: center;
    }
   
    .sec-item .pic img{
        aspect-ratio: 4/3;
    }
    .sec-item .txt{
        width: 55%;
        display: flex;
        flex-direction: column;

    }
  
    .grow{
        flex-grow: 1;
    }
    .sec-item .pic{
        margin-top: 30px;
        width: 45%;
    } 
    .aboutus-item .txt{
        text-align: left;
        padding: 30px;
        width: 60%;
        justify-content: space-around;
    }
    .aboutus-item .txt h1{
        padding: 10px;
    }
    .aboutus-card-item .txt h4{
        text-align: left;
    }
    .aboutus-item .txt h3{
        font-size: 40px;
    }
}