.math-captcha-form {
display:block;
float:none;
clear:both;
}
.login form .math-captcha-form span {
display: inline-block;
margin-bottom: 16px; 
}
input[type="text"].mc-input {
display: inline-block;
width: 60px!important;
vertical-align: middle;
margin-bottom: 0;
}