style.css

body{
    background-color: rgb(26, 26, 27);
    font-family: Arial, Helvetica, sans-serif;
}
.task-tabl{
    position: absolute;
    left: 30%;
    top: 8%;
    width: 30%;
}
h1 {
    text-align: center;
}
.task-container {
    margin: 20px auto;
    max-width: 600px;
    background: rgb(40, 40, 41)/*#fff*/;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}
.task {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
    border-bottom: 1px solid #eee;
}
.task:last-child {
    border-bottom: none;
}
.btn {
    margin-top: 10px;
    padding: 10px;
    background-color: #5cb85c;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
.btn-danger {
    background-color: #d9534f;
}