h1
{
text-align: center;
}

#MSContainer
{
position: relative;
margin: 30px auto;
text-align: center;
width: 970px;
cursor: default;
}

.leftMonster,
.rightMonster
{
position: absolute;
font-size: 100px;
top: 15px;
background-color: white;
}

.leftMonster
{
left: 0;
text-align: right;
}

.rightMonster
{
right: 0;
text-align: left;
}

.numberLine
{
display: inline-block;
vertical-align: top;
font-size: 50px;
margin-top: 45px;
}

.numberLine span
{
border: 2px solid #000;
padding: 5px 15px;
cursor: pointer;
transition: all 0.3s;
}

.numberLine span:hover
{
background-color: #3f3;
}