.btn_big_2{
     width: 49%;
     height: 17.9vh;
     color: white;
     text-align: center;
     background: #1f5290;
     font-size: 4.5vw;
     margin: 0.5%;
     border: none;
 }
.btn_big_2:hover{
    background:#004890;
    box-shadow:inset 0px 0px 15px black;
    cursor:pointer;
}
.btn_big_3{
    width: 32.33%;
    height: 17.9vh;
    color: white;
    text-align: center;
    background: #1f5290;
    font-size: 4.5vw;
    margin: 0.5%;
    border: none;
}
.btn_big_3:hover{
    background:#004890;
    box-shadow:inset 0px 0px 15px black;
    cursor:pointer;
}
.container-fluid{
	width:100vh;
}
.row{width:98%;left:10%;}
.btn_big_4{       
	width: 80%   !important;
    
    background:white;
    text-align: center;
    padding: 0;
    border: none;
	border-radius: 49%;
    margin: 5% auto;
}
.btn_big_4:hover{
    background:#01a7d2;
    box-shadow:inset 0px 0px 15px black;
    cursor:pointer;
}
.ch1{position: absolute;left:0;top:0;}
.ch2{position: absolute;left:0;bottom:5vh;}
.ch3{position: absolute;right:0;top:0;}
.ch4{position: absolute;right:0;bottom:5vh;}
.alphabet_btn{
    display: inline-block;
    width: 6.94%;
    height: 4vh;
    line-height: 4vh;
    margin: 0.1%;
    font-size: 2vh;
    background: #1f5290;
    border: none;
    color: white;
    text-align: center;
}
.alphabet_btn:hover{background: white;color: black;}


.container_content{height: calc(100vh - 4.0vh);}
.container_teacher{ margin-top: 5%;}
.mt3{margin-top: 3vh;}

/*===AdminTeacher====*/
.container-fluid_admin{
    width:100%;    
    text-align: center;
}
.period{
    width: 50%;
    text-align: center;
    font-size:1.5vw;
    margin: 0.5vh auto;
    font-weight:600;    
}
.period input{
    border: none;
    font-size:1.8vw;
    color:#23b5b2;
}
.alphabet_btn_admin{
    display: inline-block;    
    width: 2%;
/*    height: 4vh;*/
    line-height: 4vh;
    margin: 0.1%;
    font-size: 2vh !important;
    background: #23b5b2;
    border: none;
    color: white;
    text-align: center;
    border-radius: 50%;
}
.alphabet_btn_admin:hover{background: white;color:#23b5b2;;box-shadow:inset 0px 0px 15px #23b5b2;cursor:pointer;}

.box_prepod_admin{width:15%;margin:0.5vh 0.2%;line-height:6vh;text-decoration:none;color:white;font-size:1.5vw;background:#23b5b2;border:none;border-radius: 25%;}
.box_prepod_admin:hover{background: white;color:#23b5b2;;box-shadow:inset 0px 0px 15px #23b5b2;cursor:pointer;}