* {
     list-style: none;
     text-decoration: none;
     box-sizing: border-box;
     font-family: "Jost", serif;
     outline: none;
 }

 body {
     background: linear-gradient(135deg, #1e2a1ef0, #d9e4f5);
     min-height: 100vh;
 }

 .calculator-container {
     max-width: 400px;
     background-color: #beb8b6f3;
 }

 .header {
     border-bottom: 3px solid #1069a1;
     margin-bottom: 10px;
     border-radius: 5px 5px;
 }

 .bi {
     font-size: 25px;
     color: white;
 }

 #sumBtn {
     background-color: #4B781A;
 }

 #minusBtn {
     background-color: #781A61;
 }

 #multiplyBtn {
     background-color: #1A4378;
 }

 #divisionBtn {
     background-color: #786A1A;
 }

 #resetBtn {
     background-color: #B10637;
 }