styles.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
}

.container {
    max-width: 600px;
    margin: 50px auto;
    padding: 20px;
    background: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

.balance {
    text-align: center;
}

.summary {
    display: flex;
    justify-content: space-between;
    margin: 20px 0;
}

.summary div {
    text-align: center;
    flex: 1;
}

.summary .money {
    font-size: 20px;
}

.money.plus {
    color: green;
}

.money.minus {
    color: red;
}

.transaction-form,
.filter-search {
    margin: 20px 0;
}

.transaction-form input,
.transaction-form select,
.transaction-form button,
.filter-search input,
.filter-search select,
.filter-search button {
    width: calc(100% - 20px);
    padding: 10px;
    margin: 10px 0;
    border-radius: 5px;
    border: 1px solid #ddd;
}

.filter-search input,
.filter-search select {
    display: inline-block;
    width: calc(33% - 20px);
    margin-right: 10px;
}

.filter-search button {
    display: inline-block;
    width: calc(100% - 20px);
}

.transaction-list {
    margin: 20px 0;
}

.transaction-list ul {
    list-style-type: none;
}

.transaction-list li {
    background: #f4f4f4;
    padding: 10px;
    border: 1px solid #ddd;
    margin: 10px 0;
    display: flex;
    justify-content: space-between;
    border-radius: 5px;
    align-items: center;
}

.transaction-list li.plus {
    border-left: 5px solid green;
}

.transaction-list li.minus {
    border-left: 5px solid red;
}

.transaction-list .delete-btn,
.transaction-list .edit-btn {
    background: red;
    color: white;
    border: none;
    padding: 5px 10px;
    cursor: pointer;
    border-radius: 5px;
    margin-left: 5px;
}

.transaction-list .edit-btn {
    background: blue;
}

@media (max-width: 600px) {
    .summary {
        flex-direction: column;
    }
    
    .filter-search input,
    .filter-search select {
        width: calc(100% - 20px);
        margin-right: 0;
    }
}