style.css

body {
    background-color: #3725f3;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande',
    'Lucida Sans', Arial, sans-serif;
}

.box {
    background-color: black;
    width: 40%;
    height: 600px;
    border: none;
    border-radius: 1.5em;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.box h1 {
    text-transform: capitalize;
    color: white;
    font-size: 25px;
}

.box .input-btn {
    width: 80%;
    display: flex;
    flex-direction: row;
    height: 50px;
}

.box .input-btn input[type='text'] {
    width: 70%;
    background-color: transparent;
    border: solid 1.5px #490cf2;
    color: white;
    padding-left: 10px;
}

.box .input-btn input[type='text']:focus {
    outline: none;
}

.box .input-btn input[type='button'] {
    width: 30%;
    background: linear-gradient(
    90deg,
    rgba(93, 12, 255, 1) 0%,
    rgba(155, 0, 250, 1) 100%
  );
    border: none;
    cursor: pointer;
    color: white;
}

ul {
    list-style: none;
    padding: 0;
    color: aliceblue;
    width: 100%;
    overflow-y: scroll;
    height: 90%;
}

ul li {
    margin: 20px auto;
    width: 90%;
    height: 60px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    border: none;
    border-radius: 10px;
    padding: 0 5px;
}

ul li .delete-edit button {
    background-color: transparent;
    border: none;
}

ul li .delete-edit button img {
    width: 25px;
    height: 25px;
    cursor: pointer;
}