* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

body {
  background: #f4f4f4;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  padding: 20px;
}

.container {
  background: #fff;
  padding: 20px;
  width: 400px;
  max-width: 100%;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

h1, h2, h3 {
  text-align: center;
  margin-bottom: 10px;
}

.balance {
  margin: 20px 0;
  text-align: center;
}

.inc-exp-container {
  display: flex;
  justify-content: space-between;
  margin: 20px 0;
  padding: 10px;
  border: 1px solid #dedede;
  border-radius: 5px;
  background: #fafafa;
}

.inc-exp-container div {
  text-align: center;
  flex: 1;
}

.money {
  font-size: 20px;
  margin-top: 5px;
}

.money.plus {
  color: green;
}

.money.minus {
  color: red;
}

.list {
  list-style: none;
  margin: 20px 0;
}

.list li {
  background: #eee;
  display: flex;
  justify-content: space-between;
  padding: 10px;
  margin: 5px 0;
  border-right: 5px solid;
}

.list li.plus {
  border-color: green;
}

.list li.minus {
  border-color: red;
}

.form-control {
  margin-bottom: 10px;
}

input {
  width: 100%;
  padding: 8px;
  margin-top: 5px;
}

.btn {
  width: 100%;
  padding: 10px;
  background: #333;
  color: #fff;
  border: none;
  cursor: pointer;
}

.btn:hover {
  background: #555;
}