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

.container {
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(135deg, #153677, #4e085f);
    padding: 10px;

}

.todo-app {
    width: 100%;
    max-height: 540px;
    background: #0b0b0b;
    margin: 100px auto 20px;
    padding: 40px 30px 70px;
    border-radius: 10px;

}

.todo-app h2 {
    color: #f8f9fa;
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.todo-app h2 img {
    width: 40px;
    margin-right: 10px;
}

.row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #edeef0;
    border-radius: 60px;
    padding-left: 20px;
    margin-bottom: 25px;
    position: relative;
    z-index: 0;
}

.row:before {
    content: '';
    background: linear-gradient(45deg, #ff0000, #ff7300, #fffb00, #48ff00, #00ffd5, #002bff, #7a00ff, #ff00c8, #ff0000);
    position: absolute;
    top: -2px;
    left: -2px;
    background-size: 300%;
    z-index: -1;
    filter: blur(5px);
    width: calc(100% + 4px);
    height: calc(100% + 4px);
    animation: glowing 20s linear infinite;
    opacity: 0;
    transition: opacity .3s ease-in-out;
    border-radius: 50px;
}

.row:hover:before {
    opacity: 0.7;
}

.row:after {
    z-index: -1;
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: #020e02;
    left: -1px;
    top: 0;
    border-radius: 50px;
}

@keyframes glowing {
    0% {
        background-position: 0 0;
    }

    50% {
        background-position: 300% 0;
    }

    100% {
        background-position: 0 0;
    }
}

input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 10px 20px;
    font-size: 18px;
    font-weight: 14px;
    color: #f1f3f6;
    width: 100%;
}

button {
    border: none;
    outline: none;
    padding: 16px 50px;
    background: #ff5945;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    border-radius: 40px;
   
}
ul li{
    list-style: none;
    font-size: 22px;
    font-weight: 500;
    padding: 12px 8px 12px 50px;
    user-select: none;  /*help not selecting the text */
    cursor: pointer;
    color: #e670f6;
    position: relative;
}
ul li::before{
    content: '';
    position: absolute;
    height: 25px;
    width: 25px;
    border-radius: 50%;
    background-image: url(images/unchecked.png);
    background-size: cover;
    background-position: center;
    top: 12px; 
    left: 10px;
}

ul li.checked{
    color: #f1eeee;
    text-decoration: line-through;
    
}
ul li.checked::before{
    background-image: url(images/checked.png);
}

ul li span{
    position: absolute;
    right: 0;
    top: 5px;
    width: 40px ;
    height: 40px;
    font-size: 22px;
    color: #555;
    line-height: 40px;
    text-align: center;
    border-radius: 50%;
}

ul li span:hover{
    color: #f2220b;
}