.VisiCalcClass {
background:url(/staticAssets/calculators/load.gif) 50% 15% no-repeat;
background-size: 150px 150px;
min-width: 800px;
min-height:800px;
margin:0;
padding:0;
}
#Loan_Repayment_Calculator { min-height:800px !important; }
<iframe class="VisiCalcClass" id="Loan_Repayment_Calculator" src=" https://www.visionabacus.net/Tools/B3/SuiteA/Z200/MFAA/Loan_Repayment_Calculator/BlueOrange" frameborder="0" scrolling="yes"></iframe>