style.css

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

body {
    height: 100vh;
    background-image: linear-gradient(to right, rgb(129, 224, 172), rgb(113, 203, 238));
}

.container {
    width: 100%;
    padding: 50px 300px;
}

h1 {
    text-align: center;
    font-size: 50px;
    margin: 0 0 50px 0;
    color: white;
    text-shadow: 2px 1px black;
}

/* container form */
form {
    display: grid;
    grid-template-columns: 700px 100px 100px;
    align-items: center;
    justify-content: center;
    column-gap: 5px;
    margin: 0 0 30px 0;
}

form textarea {
    min-width: 700px;
    max-width: 700px;
    height: 50px;
    min-height: 50px;
    max-height: 250px;
    font-size: 20px;
    padding: 10px;
    border-radius: 10px;
    border: 2px solid black;
}

form textarea:focus {
    outline: none;
}

form button {
    width: 100px;
    max-width: 100px;
    height: 50px;
    background-color: white;
    border: 2px solid black;
    border-radius: 10px;
    font-size: 20px;
    cursor: pointer;
    transition: 1s;
    transition-timing-function: ease-in-out;
}

form .form-button-1:hover {
    background-color: dodgerblue;
    color: white;
}

form .form-button-2:hover {
    background-color: crimson;
    color: white;
}

.check {
    text-decoration: line-through
}

/* todolistAll */
.todolistAll {
    display: grid;
    grid-template-columns: 600px 95px 100px 100px;
    justify-content: center;
    align-items: center;
    column-gap: 5px;
    margin: 5px 0 0 0;
}

.todolistAll div {
    width: 600px;
    min-height: 50px;
    word-wrap: break-word;
    word-break: break-all;
    background-color: white;
    border-radius: 10px;
    border: 2px solid black;
    padding: 10px;
    font-size: 20px;
    text-align: justify;
}

.todolistAll button {
    height: 50px;
    border-radius: 10px;
    border: 2px solid black;
    background-color: white;
    font-size: 15px;
    cursor: pointer;
    transition: 1s;
    transition-timing-function: ease-in-out;
}

.todolistAll .todolistAll-btn-1:hover {
    background-color: darkorange;
    color: white;
}

.todolistAll .todolistAll-btn-2:hover {
    background-color: dodgerblue;
    color: white;
}

.todolistAll .todolistAll-btn-3:hover {
    background-color: salmon;
    color: white;
}