.center {
    text-align:center;
}

.center form {
    display:inline-block;
}

.form .submit {
width: 65px;
height: 65px;
position: absolute;
top: 38%;
right: 3%;
padding: 10px;
z-index: 2;
background: #E2F5E4;
border-radius: 50%;
box-shadow: 0 0 2px rgba(0,0,0,0.1), 0 3px 2px rgba(0,0,0,0.1), inset 0 -3px 2px rgba(0,0,0,0.2);
}

.form .submit:hover {
background: #98FAA2;
}
.form .input-group{
    padding-top: 10px;
    
}

.diamante-responsivo{
    height: 50px;
}