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

ul {
    list-style: none;
    color: #3da8f4;
}

body {
    background-color: #000;
    color: #3da8f4;
    font-family: 'Ubuntu', sans-serif;
}

.logo-sec {
    margin: 20px 10px 30px 50px;
}
#logo-text{
    display: flex;
    position: absolute;
    top: 39px;
    left: 90px; 
}
.logo-image {
    width: 55px;
    height: 55px;
}

nav {
    display: flex;
    justify-content: space-between;
}

.nav-links {
    display: flex;
    margin: 30px 60px 30px 0px;
}

.nav-links li a {
    margin: 0px 20px 0 40px;
    color: #3da8f4;
    font-size: 22px;
    text-decoration: none;
    text-align: center;
}

.angle-unit {
    font-size: 15px;
}

h3 {
    margin: 10px auto;
    font-family: 'Ubuntu', sans-serif;
    font-size: 40px;
    font-weight: bold;
    text-align: center;
    letter-spacing: 5px;
    text-shadow: 3px 0px 7px rgba(104, 98, 81, 0.8), -3px 0px 7px rgba(3, 7, 22, 0.8), 0px 4px 7px rgb(81 67 21 / 80%);
}

.container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

label {
    font-size: 30px;
    letter-spacing: 2px;
    margin-top: 8px;
    margin-bottom: 10px;
}

input {
    width: 400px;
    padding: 10px;
    margin: 10px;
    border-radius: 15px;
    font-size: 20px;
}

input::placeholder {
    font-size: 15px;
}

#is-triangle-btn {
    font-weight: 700;
    font-size: 20px;
    padding: 10px 30px;
    margin-top: 10px;
    border-radius: 20px;
    color: #000;
    cursor: pointer;
    background-color: #3da8f4;
}

#output {
    font-size: 30px;
    border: 1px solid #fff;
    padding: 20px;
    margin-top: 20px;
    display: none;
}