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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.calculator {
    background: whitesmoke;
    box-shadow: 0, 20px 60px rgba(0 0 0 0.3);
    border-radius: 20px;
    padding: 30px;
    max-width: 400px;
    width: 100%;
}
h1 {
    color: rgb(3, 54, 54);
    text-align: center;
    margin-bottom: 20px;
}
.number1 {
    margin-bottom: 20px;
}
label {
    display: block;
    margin-bottom: 5px;
    color:rgb(115, 103, 12);
    font-weight: bold;
}
input {
    width: 100%;
    padding: 15px;
    font-size: 18px;
    border: 2px solid rgb(39, 165, 151);
    border-radius: 10px;
    transition: border-color 0.3s;
}
input:focus {
    outline: none;
    border-color: rgb(255, 106, 0);
}
.buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}
button {
    font-size: 15px;
    font-weight: bold;
    border-radius: 20px;
    border: none;
    color: rgb(11, 149, 57);
    transition: all 3s;
    cursor: pointer;
}
button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(15, 240, 3, 0.2);
}
.button-add {
background: #4ecdc4;
}

.button-subtract {
background: #ff6b6b;
}

.button-multiply {
 background: #f9ca24;
}

.button-divide {
background: #a29bfe;
}
.result {
    background-color: #bbb7ec;
    padding: 10px;
    border-radius: 20px;
    font-size: 25px;
    font-weight: bold;
    text-align: center;
    min-height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
}
.result-btn {
    font-size: 14px;
    color: rgb(63, 10, 1);
    margin-bottom: 5px;
}