body {
    font-family:Verdana, Tahoma, sans-serif;
    background: linear-gradient(120deg, #676866, #2f312b);
    display: flex;
     align-items: center;
    justify-content: center;
    height: 100vh;
    padding: 0 20px;
    margin: 0;
}


.container {
    background: rgb(52, 48, 54);
    padding: 20px;
    border-radius: 11px;
    box-shadow: 0 3px 15px rgba(248, 246, 246, 0.2);
     max-width: 400px;
    width: 100%;
    text-align: center; 
}

h1 {
    font-size: 25px;
    margin-bottom: 10px;
    color: #eee9e9;
}

p {
    font-size: 16px;
    color: #eee9e9;
    margin: 10px 0;
}

#number{
    width:80%;
    padding: 10px;
    border: 1px solid #ddd;
     margin: 10px 0;
    border-radius: 5px;
     font-size: 14px;
}
.btns{
    display:inline;
     justify-items: center;
    align-items:center;
}
#check{
    background: #0dabdb;
    color: white;
     font-weight:bold;
    border: none;
    padding: 10px 50px;
     font-size: 16px;
    cursor: pointer;
    border-radius: 5px;
    transition: 0.3s;
    margin-left: 160px;
}
#restart{
    display:none;
    background: #0dabdb;
    color: white;
     font-weight:bold;
    border: none;
    padding: 9px 45px;
     font-size: 16px;
    cursor: pointer;
    border-radius: 5px;
    transition: 0.3s;
     margin-left: 40px;
    margin-top: -39px;
}

#check:hover {
    background: #0b669b;
}
#restart:hover {
    background: #0b669b;
}

#result {
    margin-top: 15px;
    font-size: 16px;
    color: #e71818;
}


@media (min-width: 320px) {
    button {
        width: auto;
    }
}