*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

.container{
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(135deg , #626262,#000000);
    padding: 10px;
}

.todo-app{
    width: 100%;
    max-width: 540px;
    background-color:#1a1a1a;
    margin: 100px auto 20px;
    padding: 40px 30px 70px;
    border-radius: 10px;

}
.todo-app h2{
    color: #fff;
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    /* justify-content: center; */
}

.row{
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #323232;
    border-radius: 30px;
    padding-left: 20px;
    margin-bottom: 25px;
}
input{
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 10px;
    font-weight: 14px;
    font-size: 17px;
}
button{
    border: none;
    outline: none;
    padding: 16px 50px;
    background: #f45b0f;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    border-radius: 40px;
}

ul li{
    list-style: none;
    font-size: 17px;
    padding: 10px 10px 15px 50px;
    margin-bottom: 10px;
    user-select: none;
    cursor: pointer;
    position: relative;
    background-color: #323232;
    border-radius: 40px;
}
ul li ::before{
    content: '';
    position: absolute;
    height: 28px;
    width: 28px;
    border-radius: 50px;
    background-position: center;
    background-size: cover;
    top: 12px;
    left: 8px;
}

ul li.checked{
    color: #1a1a1a;
    text-decoration: line-through;
}
ul li span{
    position: absolute;
    right: 7px;
    top: 7px;
    width: 30px;
    height: 30px;
    font-size: 22px;
    color: #fff;
    line-height: 30px;
    text-align: center;
    border-radius: 50px;
}
ul li span:hover{
    background: #525252;
}