*{ 
    margin: 0;
    padding:0;
    font-family: "Poppins", sans-serif; 
}

.top {
    bottom: 20px;      
    margin-right:10px; 
    place-self: end;
    
    /* visual styling */
    text-decoration: none;
    padding: 10px;
    font-family: sans-serif;
    color: #fff;
    background: #2c1338;
    border-radius: 100px;
    white-space: nowrap;
  }

section {
    border-top: 1px solid rgba(0,0,0,.25)
    
}

/*Navigation section*/
#header-img{
    height: 11vh;
    background: url(acs-logo.png);
    background-size: cover;
    position: relative;
    z-index: 1;
    background-attachment: fixed;
    color: rgb(163, 133, 184);
    display: flex;
    align-items: flex-end;
}

#header-img img{
    height: 70px;
    margin: 0 12px 12px 12px;
}

#nav-bar{
    list-style-type: none;
    background:rgb(175, 144, 197) ;
    font-family: "Poppins", sans-serif;
    position: sticky;
    top: 0;
    margin: 0;
    padding: 0;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

#nav-bar li{
    display: inline-block;
    font-size: 20px;
    transition: 0.6s;
}

#nav-bar li a{
    color: rgb(60, 0, 100);
    text-decoration: none;
    padding: 12px;
    display: inline-block;
    font-family: "Poppins", sans-serif;
}

#nav-bar li:hover{
    background: #905ec0;
}

/*Banner section*/
.banner{
    background-color:#FEFEFE;
}

.program{
    background:#FEFEFE;
    padding-left: 15%;
    padding-right: 15%;
    padding-top: 3vh;
    padding-bottom: 3vh;
    
}

/*About section*/
.about{
    background:#FEFEFE;
    padding-left: 15%;
    padding-right: 15%;
    padding-top: 3vh;
    padding-bottom: 3vh;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 23px;
}

.a_detail{
text-align: center;
line-height: 35px;
font-size: 25px;
}

.registration{
    background:#FEFEFE;
    padding-left: 15%;
    padding-right: 15%;
    padding-top: 3vh;
    padding-bottom: 3vh;
}

#registration img{
    width: 20%;
}

.regis_description{
    line-height: 25px;
    font-size: 23px;
    text-align: justify;
    padding-bottom: 10px;
    font-family: "Nunito", sans-serif; 
}

/*Introduction section*/
.intro{
    padding-top: 3vh;
    padding-bottom: 3vh;
    padding-left: 15%;
    padding-right: 15%;
    font-family: Arial, Helvetica, sans-serif;
}

.intro_description{
    line-height: 25px;
    font-size: 20px;
    text-align: center;
    padding-bottom: 10px;
    font-family: "Nunito", sans-serif; 
}

.center{
    display: block;
    margin-left: auto;
    margin-right: auto;
    width:75%; 
}

h1{
    padding-top: 10px;
    padding-bottom: 15px;
    font-size: 40px;
    text-align: center;
    font-family: "Poppins", sans-serif;
}

/*Program section*/
.itin{
    background:#FEFEFE;
    border: 1px solid rgb(69, 124, 69);
    text-align: left;
    padding: 8px;
    margin-top: 10px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 10px;
    width:70%;
  }
  
  th{
    text-align: center;
    font-size: 20px;
  }
  td{
    padding: 10px;
    line-height: 25px;
    font-size: 18px;
  }
  tr:nth-child(even) {
    background-color: #dee0de;
  }

/*Keynote speaker section*/
.speaker{
    background:#FEFEFE;
    padding-top: 3vh;
    padding-bottom: 3vh;
    padding-left: 15%;
    padding-right: 15%;
    font-family: Arial, Helvetica, sans-serif;
}

.Ltitle{
    text-align: center;
    font-size: 22px;
    padding-top: 20px;
}

.Sdetail{
    text-align: center;
    line-height: 25px;
    padding-bottom: 30px;
    font-family:Verdana, Geneva, Tahoma, sans-serif;
    font-size: 23px;
}

.ab_header{
    padding-top: 5px;
    padding-bottom: 10px;
    font-size: 18px;
}

.ab_des{
    text-align: justify;
    line-height: 25px;
    padding-bottom: 10px;
    font-size: 18px;
    font-family: "Nunito", sans-serif; 
}

.sup{
    position: relative;
    bottom: 1ex;
    font-size: 80%;
}


.wrapper{
    padding: 5px;
    max-width: 1250px;
    width: 85%;
    margin: 20px auto;
}

.columns{
   display: flex;
   flex-flow: row wrap; 
   justify-content: center;
   margin: 5px 0;
}

.column{
    flex: 1;
    margin: 2px;
    padding: 10px;
    background: white;
    transition: 0.3s;
}

.column:first-child{
    margin-left: 0;
    padding-top: 1vh;
    
}

.column:last-child{
    margin-right: 0;
    padding-top: 1vh;
}

/*Poster section*/
.poster{
    background:#FEFEFE; 
    padding-top: 3.5vh;
    padding-bottom: 3vh;
    padding-left: 15%;
    padding-right: 15%; 
    font-family: "Nunito", sans-serif; ;
}

/*Committee section*/
.committee{
    background:#FEFEFE;
    padding-top: 3vh;
    padding-bottom: 3vh;
    padding-left: 15%;
    padding-right: 15%;
    font-family: "Nunito", sans-serif; ;
}

.column2{
    column-count: 3;
    column-gap: normal;
    line-height: 25px;
    padding-left: 4.5vw;
    padding-top:1vh;
    padding-right: 12px;
    text-align: left;
    font-size: 16px;
}

/*Sponsor section*/
.sponsor{
    background:#FEFEFE;
    padding-top: 3vh;
    padding-bottom: 3vh;
    padding-left: 15%;
    padding-right: 15%;
    font-family: Arial, Helvetica, sans-serif;
}

/*Map section*/
.map{
    background:#FEFEFE;
    color: black; 
    padding-top: 3vh;
    padding-bottom: 3vh;
    padding-left: 15%;
    padding-right: 15%;
    font-family: Arial, Helvetica, sans-serif;
}

.map_des{
    padding-top:1vh;
    padding-bottom: 2vh;
    font-size: 18px;
    line-height: 25px;
    text-align: center;
    font-family: "Nunito", sans-serif; 
}

/*Contact Us section*/
.contact{
    background-color:rgb(150, 149, 149);   
    padding-top: 3vh;
    padding-bottom: 3vh;
    padding-left: 5vw;
    padding-right: 5vw;
    font-family: Arial, Helvetica, sans-serif;
}

.copyright{
    background-color:rgb(109, 108, 108);   
    padding-top: 3vh;
    padding-bottom: 3vh;
    padding-left: 5vw;
    padding-right: 5vw; 
    text-align: center;
    text-transform: capitalize;
    font-family: Arial, Helvetica, sans-serif;
}