style.css

.container {
    font-family: Arial, Helvetica, sans-serif;
    border-bottom: 1px solid #ddd;
    margin-bottom: 20px;
    width: 100%;
}
.container div {
    display: inline-block;
    width:  49%;
    overflow: auto;
    padding: 10px 0;
    margin-top: 20px;
    margin-bottom: 20px;
    vertical-align: top;
}
.customInputs {
    width: 90%;
    padding: 5px;
    margin-bottom: 15px;
}
.btn {
    padding: 7px;
    border: 0;
    box-shadow: 2px 2px 3px 0px rgba(0,0,0,0.3);
    margin-right: 10px;
    color: #ffffff;
}
.btn:hover {
    box-shadow: 2px 2px 3px 0px rgba(0,0,0,0.5);
}
.btn:active {
    box-shadow: inset 2px 2px 10px 0px rgba(0,0,0,0.4);
}
.btn-create {
    background: #4AB933;
}
.btn-calculate {
    background: #4267B2;
}
.btn-search {
    background: #F36B7E;
}
table, td {
    border: 1px solid #ddd;
    border-collapse: collapse;
    padding: 10px;
    text-align: center;
}
footer {
    color: rgba(160, 160, 160, 1);
    text-align: center;
    font-size: 12px;
}