style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Times New Roman', Times, serif;
}

body {
    background-image: linear-gradient(to right, #605e7e, #6b73c1, #37b3cc);
    margin: 50px 2%;
}

/* container title */
.container-title {
    font-size: 25px;
    text-align: center;
    margin: 0 0 30px 0;
    color: white;
    text-shadow: 3px 1px black;
}

/* container */
.inputcol {
    display: grid;
    column-gap: 5px;
    grid-template-columns: 60% 10%;
    justify-content: center;
    margin-top: 10px;
}

.textarea {
    min-height: 50px;
    height: 50px;
    max-width: 100%;
    min-width: 100%;
    border-radius: 10px;
    border-color: #333;
    font-size: 20px;
    padding: 10px 10px;
    overflow: auto;
    overflow-x: hidden;
}

.textarea::-webkit-scrollbar-track {
    border-radius: 10px;
    background-color: #333;
}

.textarea::-webkit-scrollbar {
    width: 10px;
    cursor: pointer;
}

.textarea::-webkit-scrollbar-thumb {
    border-radius: 10px;
    background-color: #8f8acc;
    cursor: pointer;
}

.textarea:focus {
    outline: none;
}

.buttoninput {
    border-radius: 10px;
    border-color: #333;
    background-color: white;
    font-size: 20px;
}

.buttoninput:hover {
    background-color: #8f8acc;
    color: white;
}

/* js */
.todolist {
    margin-top: 20px;
}

.itemall {
    display: grid;
    grid-template-columns: 60% 5% 5%;
    justify-content: center;
    margin-bottom: 2px;
}

.item, .check-button, .trash-button {
    border: none;
    background-color: white;
    min-height: 50px;
    padding: 10px 10px;
}

.item {
    word-wrap: break-word;
    word-break: break-all;
    border-radius: 10px 0 0 10px;
    display: grid;
    align-content: center;
    font-size: 20px;
}

.check-button, .trash-button {
    font-size: 15px;
}

.trash-button {
    border-radius: 0 10px 10px 0;
}

.check-button:hover {
    background-color: #37b3cc;
    color: white;
}

.trash-button:hover {
    background-color: #6b73c1;
    color: white;
}

.checklist {
    text-decoration: line-through;
}

.fa-check, .fa-trash {
    pointer-events: none;
}

button, .check-button, .trash-button {
    cursor: pointer;
}