.wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.main {
    max-width: 350px;
    margin: 0 auto;
}

#submit-button{
    display: none;
    text-align: center;
    width: 100%;
}

#lider{
    text-align: center;
    margin: 0;
}

/* Start by setting display:none to make this hidden.
   Then we position it in relation to the viewport window
   with position:fixed. Width, height, top and left speak
   for themselves. Background we set to 80% white with
   our animation centered, and no-repeating */
.modal {
    display:    none;
    position:   fixed;
    z-index:    1000;
    top:        0;
    left:       0;
    height:     100%;
    width:      100%;
    background: rgba( 255, 255, 255, .8 ) 
                url('http://i.stack.imgur.com/FhHRx.gif') 
                50% 50% 
                no-repeat;
}

/* When the body has the loading class, we turn
   the scrollbar off with overflow:hidden */
body.loading .modal {
    overflow: hidden;   
}

/* Anytime the body has the loading class, our
   modal element will be visible */
body.loading .modal {
    display: block;
}

.row {
    margin-bottom: 20px !important;
}

button:hover{
	cursor: pointer;
}