body{margin:0;padding:0;font-size:1rem;font-family:Arial,Verdana,Helvetica,sans-serif;background-color:#f5f5f5}.container{max-width:1400px;margin:0 auto;background-color:#fff;padding:15px}p{margin-bottom:0}h2{font-size:1.6rem;font-weight:400;color:#023969}h3{margin:0;color:#023969}ul{list-style:none;margin:0;padding:0}.flex{display:flex;flex-direction:row;justify-content:space-between}button{width:100%;font-size:4rem;font-weight:700;color:#023969;background-color:#f5f5f5;border:1px solid #023969;cursor:pointer}button#clear{font-size:1.5rem;font-weight:700;color:#dc5c6b;padding:20px 0;margin:25px 0;border:1px solid #dc5c6b;background-color:#f0f0f0}header{position:sticky;top:0}#main-head{background-color:#fff;padding-bottom:5px}#logo{margin-top:15px;display:block}#logo img{max-height:100px}#total-amount{font-size:1.1rem}#amount,#change{font-weight:700}#amount-money{border-top:1px solid #e1e1e1;border-bottom:1px solid #e1e1e1;align-items:center;justify-content:center;gap:10px;margin-top:10px;padding:10px 0}#amount-money p{margin:0}input#received-amount{width:100px;font-size:1.1rem;font-weight:700;text-align:right}.product-content{margin-bottom:10px}.product{flex:1 1 60%;text-align:center;align-content:center;background-color:#f5f5f5}p span{font-weight:700}.sign-minus,.sign-plus{flex:1 1 20%;text-align:center;align-content:center}footer{margin-bottom:20px}