style.css

* {
    box-sizing: border-box;
}
.root {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    width: 650px;
    margin: 100px auto;
    padding: 20px 30px 40px;
    border: 2px solid #000;
    border-radius: 15px;
    background-color: #bcbcbc;
}
.button {
    border: 2px solid #000;
    background-color: aquamarine;
    font-size: 16px;
    text-align: center;
    border-radius: 10px;
    padding: 10px;
    min-width: 150px;
    min-height: 50px;
    cursor: pointer;
}
.button:hover {
    transform: scale(1.1);
    font-weight: 700;
}

.input {
    border: 2px solid #000;
    background-color: #fff;
    font-size: 16px;
    text-align: center;
    border-radius: 10px;
    min-width: 250px;
}
.dataElement {
    position: relative;
    border: 2px solid #000;
    border-radius: 15px;
    padding: 20px 20px 20px 60px;
    background-color: #bcbcbc;
    width: 100%;
    margin-top: 20px;
}
.check {
    position: absolute;
    top: 33%;
    left: 10px;
    border: 2px solid #000;
    background-color: aquamarine;
    font-size: 12px;
    text-align: center;
    border-radius: 5px;
    padding: 5px 15px;
}
.check:hover {
    transform: scale(1.1);
    font-weight: 700;
}

.textTodo {
    border: 2px solid #fff;
    background-color: #fff;
    border-radius: 5px;
    text-align: center;
    padding: 10px 10px;
    width: 80%;
    font-size: 16px;
    font-style: italic;
}
.button__closed {
    border: 2px solid #000;
    background-color: aquamarine;
    font-size: 12px;
    text-align: center;
    border-radius: 5px;
    padding: 5px 15px;
    position: absolute;
    top: 10px;
    right: 10px;
    cursor: pointer;
}
.button__closed:hover {
    transform: scale(1.1);
    font-weight: 700;
}
.date {
    border-radius: 5px;
    border: 2px solid #fff;
    background-color: white;
    padding: 0 10px;
    position: absolute;
    right: 10px;
    top: 50px;
}
.textDecoration {
    text-decoration: line-through;
    background-color: orange;
}